A catback is the WRX exhaust upgrade most owners can enjoy every day. It changes the sound, fills the rear bumper better, and usually does not require tuning because it installs behind the catalytic converter and oxygen sensors. The hard part is choosing the right one for your chassis. A quiet daily-driver catback for a 2022+ VB WRX, a hatchback exhaust for a 2008-2014 GR, and a loud single-exit titanium setup for a VA STI solve very different problems.
The old version of this guide only covered 2015+ WRX and STI exhausts. That is too narrow for the way people search. A 2022+ VB WRX uses a different exhaust fitment than a 2015-2021 VA WRX, GR/GV sedan and hatchback parts are not always interchangeable, and GD-era WRX/STI exhausts have their own fitment path. If you are searching “best WRX catback exhaust” without specifying chassis, start by choosing the section that matches your car.
Quick answer: for a 2022+ VB WRX, the AWE Touring is the best overall daily-driver catback, the COBB stainless system is the most conservative VB pick, and the ETS resonated/muffled setup is the best configurable enthusiast pick. For a 2015-2021 VA WRX, the Invidia Q300 is still the safest quiet daily recommendation, while the GrimmSpeed Gentleman’s V2 and Borla S-Type are stronger current alternatives than many older discontinued or hard-to-stock options. For a 2015-2021 VA STI, the HKS Hi-Power Spec-L II is the best lightweight refined pick. For 2008-2014 GR/GV and 2002-2007 GD cars, shop by exact sedan/hatch and WRX/STI fitment first; exhaust availability is more fragmented, but Invidia, COBB, HKS, Tomei, and Borla remain the brands to cross-shop.
Choose Your WRX Chassis
How We Picked These WRX Catback Exhausts
We did not physically test every exhaust. We checked current manufacturer pages, retailer listings, other buying guides, owner discussions, retailer reviews, and install/sound notes. For exhausts, we weighted fitment and livability more heavily than peak horsepower claims because most catbacks are bought for sound, build quality, weight, tip appearance, and drone control.
Review sources checked include current product/spec pages from AWE, Borla, ETS, Remark, COBB, GrimmSpeed, HKS, and Tomei, retailer context from MAPerformance, RallySport Direct, SubiSpeed, and Import Image Racing, plus owner discussion from NASIOC, IWSTI, Reddit WRX/VB_WRX threads, DSPORT exhaust shootout summaries, and YouTube sound comparisons. VB long-term review volume is thinner than VA review volume, so current fitment, resonator choices, warranty, and manufacturer support carry extra weight for VB picks.
| Factor | Weight | What mattered |
|---|---|---|
| Correct fitment | 25% | VB vs VA WRX vs VA STI, sedan fitment, tip clearance, stock hanger locations |
| Sound and drone control | 25% | Highway drone, cold start, resonated/muffled options, daily-driver comfort |
| Owner and retailer signal | 20% | Repeated praise, repeated complaints, install notes, sound feedback |
| Build quality | 15% | T304 stainless or titanium, weld quality, clamps, flanges, warranty |
| Value | 10% | Price relative to material, fitment, noise control, and included hardware |
| Weight and performance support | 5% | Weight savings, 3 inch routing, flow path for tuned builds |
WRX Catback Fitment By Chassis
| Chassis | Years | Engines | Fitment warning | Best shopping approach |
|---|---|---|---|---|
| GD WRX/STI | 2002-2007 | EJ205/EJ257 | Sedan/wagon and WRX/STI listings vary by year and body | Verify exact body style, rear bumper, and downpipe flange before buying |
| GR/GV WRX/STI | 2008-2014 | EJ255/EJ257 | Hatchback and sedan catbacks are different | Separate hatch and sedan listings; do not assume “08-14” covers both |
| VA WRX | 2015-2021 | FA20DIT | VA WRX and STI share many catback listings, but confirm sedan fitment | Shop current VA WRX sedan listings and sound/drone reviews |
| VA STI | 2015-2021 | EJ257 | EJ sound is different, and special STI trims may have fitment notes | Verify VAB/USDM compatibility and rear bumper/tip clearance |
| VB WRX | 2022+ | FA24DIT | Does not share VA exhaust fitment | Shop VB-specific catbacks only |
Best 2022+ VB WRX Catback Exhausts
| Pick | Best for | Layout | Main drawback |
|---|---|---|---|
| AWE Touring | Daily driver, no-drone priority | 3 inch T304L, quad tips, Touring mufflers | Premium price |
| COBB SS | Conservative street build | 3 inch 304 stainless to dual 2.5 inch, quad tips | Less dramatic than louder systems |
| Borla S-Type | Refined aggressive tone | 3 inch to dual 2.25 inch, quad tips | Fewer sound-level choices |
| ETS Catback | Configurable enthusiast setup | True 3 inch to dual 3 inch, quad tips | Need to choose resonator/muffler combo carefully |
| PERRIN Dual Exit | Resonated value street setup | 3 inch resonated midpipe, dual 4.5 inch tips | Dual-exit look, not quad-tip OEM style |
| Remark Sports Touring | Value and modularity | 3 inch to 2.5 inch Y, quad 4 inch tips | Review volume is still thinner |
AWE is the best overall VB recommendation because it gives buyers a clear daily-driver path. AWE lists Touring and Track versions for the 2022+ WRX, with 3 inch catback routing, T304L stainless construction, chrome silver or diamond black 4 inch tips, and its 180 Technology resonators on the Touring version. Retailer and owner discussion consistently frame the Touring as the safer choice for people who commute, while the Track version is for owners who knowingly want more volume.
The real advantage is that AWE makes the sound-level decision simple. Start with Touring if this is your only car. Choose Track only if louder cold starts and more cabin presence are acceptable.
Buy if: you want the best daily-driver VB catback and are willing to pay for drone control.
Skip if: you want the cheapest system or you know you want a raw, single-exit sound.
Review evidence: strong for a VB exhaust. Retailer pages and owner discussions repeatedly mention fitment, build quality, and Touring’s highway manners.
The COBB stainless catback is the conservative VB choice. COBB lists 2022-2026 WRX fitment, 304 stainless construction, 3 inch tubing to dual 2.5 inch rear sections, quad tips, and a sound profile meant to be noticeable over stock without turning the car into a drone project. That fits the buyer who wants a clean Subaru-tuner solution more than a maximum-volume exhaust.
COBB’s own Q&A is also useful for buyers new to WRX exhausts: COBB states that installing this catback does not require additional tuning. That does not mean all exhaust work is tune-free; it means this rear-section catback is a different kind of mod than a downpipe or j-pipe.
Buy if: you want a current VB catback with conservative sound, strong fitment support, and COBB ecosystem confidence.
Skip if: your main goal is the loudest cold start or a titanium weight drop.
Borla’s S-Type is the polished, mainstream alternative for VB WRX owners who want a premium stainless exhaust without getting lost in too many options. Borla lists 2022-2025 WRX fitment, T-304 stainless construction, 3 inch to dual 2.25 inch routing, dual split rear exit, quad 3.5 inch tips, and a Million Mile Warranty. Borla also positions the S-Type as aggressive without drone or resonance.
That makes it a strong pick for an owner who wants the car to sound modified but still mature. It is not the most configurable exhaust here, but the lack of choice can be useful if you want a proven bolt-on from a huge exhaust brand.
Buy if: you want a refined stainless catback from a major exhaust manufacturer.
Skip if: you want titanium weight savings, a single exit, or multiple resonator/muffler options.
The ETS VB catback is the best pick when you want to choose the personality of the exhaust before buying. ETS lists true 3 inch T304 stainless from the mating flange to the muffler section, V-band connections, quad 3.5 inch double-wall tips, and configurations that include extreme, muffled, resonated, and non-resonated sound paths.
That configurability is valuable because the “best” WRX exhaust is often the one that matches your tolerance for drone. A muffled resonated ETS setup is the safer street choice. An extreme non-resonated setup belongs with owners who already know they want volume.
Buy if: you want a VB catback with real sound-level choices and a performance-oriented 3 inch layout.
Skip if: you do not want to decide between resonated, non-resonated, muffled, and extreme options.
PERRIN’s VB dual-exit catback is the value-minded resonated street pick. PERRIN lists 2022-2026 WRX fitment, 304 stainless construction, a 3 inch resonated midpipe, and two 4.5 inch tips. The resonator is the important part for this recommendation because it targets the buyer who wants sound without choosing a bare non-resonated setup for a commute.
The obvious tradeoff is appearance. This is a dual-exit system, not a quad-tip system, so it changes the rear look more than AWE, COBB, Borla, ETS, or Remark quad layouts.
Buy if: you want a resonated VB catback from a Subaru-focused brand at a more approachable price.
Skip if: you want to keep the quad-tip rear look.
Remark’s Sports Touring catback is the value-minded VB recommendation. Remark lists 2022+ WRX fitment, 3 inch piping to a 2.5 inch Y, quad 4 inch slant-cut tips, T304 stainless construction, proprietary mufflers, and resonated or non-resonated midpipe options. The brand also warns that its Sports Touring catback is not compatible with its OEM-layout axleback/midpipe pieces because flange positions differ.
Owner-review volume is not as deep as older VA exhausts, but the available feedback points toward a livable sound when configured sensibly. Choose the resonated path if drone is a major concern.
Buy if: you want a VB catback with good value, big tips, and resonated/non-resonated options.
Skip if: you already own a Remark axleback and expected to mix every part.
Best 2015-2021 VA WRX Catback Exhausts
| Pick | Best for | Sound | Main drawback |
|---|---|---|---|
| Invidia Q300 | Daily use | Mild to moderate | Too quiet for some owners |
| GrimmSpeed Gentleman’s V2 | Current Subaru-focused street build | Resonated or non-resonated | Newer V2 has less long-term owner volume than older Invidia picks |
| Borla S-Type | Mainstream premium stainless | Aggressive but polished | Less WRX-specific owner volume than Invidia |
| Invidia R400 | Aggressive street sound | Moderate to loud | More drone risk with j-pipe/downpipe changes |
| Tomei Expreme Ti | Weight savings and volume | Loud single exit | Too loud for many commuters |
| COBB Titanium | Premium lightweight build | Refined performance tone | Expensive |
The Invidia Q300 remains the safest VA WRX daily-driver pick because its reputation has held up over years of owner feedback. It is the exhaust people recommend when someone wants more tone than stock without turning every highway drive into a drone test. It uses a quad-tip layout that fills the rear bumper well, and the stainless construction and Invidia fitment reputation make it a low-drama choice.
The common complaint is also its strength: some owners think it is too quiet, especially on an otherwise stock car. If you want the car to be obviously louder every time you start it, the R400 or Tomei will make more sense.
Buy if: your VA WRX is a daily driver and you want the least regrettable sound upgrade.
Skip if: you want a loud exhaust or already have a louder j-pipe and want maximum volume.
Review evidence: very strong. Across forums and retailer reviews, Q300 feedback is consistently about livability and low drone.
The GrimmSpeed Gentleman’s V2 is the strongest current Subaru-specialist alternative to the long-running Invidia picks. GrimmSpeed lists 2015-2021 WRX and STI sedan fitment, 304 stainless construction, quad 3.5 inch tips, and resonated or non-resonated versions. Choose resonated for the daily-driver path and non-resonated only if you want extra volume.
Because the V2 is a newer/relaunched current product, it does not have the decade-plus owner-review depth of Q300/R400 threads. The reason it still belongs high on the list is current availability, Subaru-specific engineering, and the option to choose a more restrained or more aggressive configuration.
Buy if: you want a current VA catback from a Subaru-focused brand and like having resonated/non-resonated choices.
Skip if: you only trust exhausts with many years of accumulated owner threads.
Borla’s S-Type for the VA WRX/STI sedan is the mainstream premium stainless pick. Borla lists T-304 stainless construction, 3 inch to dual 2.25 inch routing, quad 3.5 inch tips, and its S-Type sound level. Owner sentiment is not as deep as Q300/R400, but the available discussion is generally positive around tone and build quality.
This is the pick for buyers who want a polished sound from a major exhaust manufacturer and do not want to chase forum-favorite Subaru-only brands.
Buy if: you want a premium stainless VA exhaust from a large exhaust brand.
Skip if: you want the most WRX-specific owner-review volume before buying.
The Invidia Gemini R400 is the better VA WRX pick if the Q300 sounds too restrained. It keeps the quad-tip look, deepens the tone, and gives the car a more obvious modified sound under throttle. It also pairs visually with the VA bumper better than a single-exit system for owners who want a balanced rear end.
The tradeoff is cabin presence. Owner discussions often put the R400 in the livable-but-not-quiet category, and cars with an aftermarket j-pipe can get noticeably louder. If you commute long distances, be honest about drone tolerance before choosing it over the Q300.
Buy if: you want a louder VA WRX exhaust while keeping quad tips.
Skip if: you are sensitive to highway drone or want a subtle neighborhood-friendly cold start.
The Tomei Expreme Ti is the lightweight single-exit choice. Tomei lists titanium construction, an 80 mm main pipe, 115 mm exit, straight-through muffler design, and a large weight drop compared with the stock system on VAB/VAG applications. It is the exhaust to buy when saving weight and getting a raw sound matters more than keeping a quiet quad-tip street setup.
Do not buy a Tomei because you vaguely want a little more sound. Buy it because you want a single exit, you like titanium exhaust character, and you can live with a louder car.
Buy if: you want weight savings, a single-exit look, and a loud motorsport-style tone.
Skip if: you want the car to stay refined on long highway drives.
COBB’s titanium 3 inch catback is the premium VA option. COBB lists 2011-2021 WRX sedan and 2011-2021 STI sedan fitment, grade 4 titanium construction, back-purged welds, slip-fit adjustability, blued titanium tips, and an assembled weight of 24 pounds. COBB also says the system was designed for a refined note rather than the tinny sound some titanium exhausts can produce.
This is not the value pick. It is for owners who want titanium weight savings, COBB branding, and a more polished premium route than a cheap loud exhaust.
Buy if: you want a premium lightweight VA catback and the budget is not the limiting factor.
Skip if: price per decibel is the main thing you care about.
Best 2015-2021 VA STI Catback Exhausts
| Pick | Best for | Sound | Main drawback |
|---|---|---|---|
| HKS Hi-Power Spec-L II | Refined lightweight STI build | Sporty, controlled | Verify exact VAB/USDM fitment before ordering |
| Invidia Q300 | Daily-driver STI | Mild to moderate | Too restrained for some EJ owners |
| Invidia R400 | Aggressive street STI | Moderate to loud | Can be too much with other exhaust mods |
| Tomei Expreme Ti | Lightweight single-exit STI | Loud | Not subtle |
The HKS Hi-Power Spec-L II is the best refined VA STI pick because it combines a lighter design with a controlled sound target. HKS lists WRX STI VAB fitment, S304 construction, 94 mm left/right tips, 65-50 mm dual routing, 89 dB close noise versus 78 dB stock in its listed application data, and a 10.4 kg weight that HKS states is 54% lighter than stock.
This is the right kind of exhaust for an STI owner who wants a real sound upgrade without jumping straight to the loudest single-exit setup. As always with Japanese-market HKS data and USDM VA STI shopping, confirm the exact part number and fitment with the retailer before purchase.
Buy if: you want a premium lightweight STI catback with a more refined sound target.
Skip if: you want the loudest possible EJ sound per dollar.
The Q300 makes even more sense for STI owners who daily drive the car. The EJ257 already has a stronger exhaust personality than the FA20 WRX, so you do not need to chase the loudest catback to hear the car. The Q300 gives the STI a deeper tone and cleaner rear-end look without making it miserable on the highway.
Buy if: you want a livable STI catback and prefer low-drone owner feedback over maximum volume.
Skip if: your STI is a weekend car and you want an aggressive exhaust every time you drive it.
The R400 is the better STI pick when the Q300 is too quiet but you still want a quad-tip exhaust. It gives the EJ car a more aggressive edge without the visual asymmetry of a single exit. With downpipe changes or other exhaust work, expect the system to get much louder than it sounds on a mostly stock STI.
Buy if: you want a louder STI catback with the classic quad-tip look.
Skip if: drone or cold-start volume is a serious concern.
The Tomei is the STI single-exit pick for the same reason it is the VA WRX single-exit pick: it is light, simple, and loud. Tomei’s listed titanium construction, 80 mm pipe, 115 mm exit, and straight-through muffler design make it the opposite of the quiet commuter choice.
Buy if: you want a lightweight STI exhaust and are comfortable with a louder single-exit setup.
Skip if: you want subtle sound or a symmetrical quad-tip rear end.
Best 2002-2014 WRX STI Catback Exhausts
Older WRX/STI exhaust shopping needs more fitment discipline than the newer VA/VB sections. The biggest trap is body style. A 2008-2014 hatchback catback is not the same as a 2011-2014 sedan catback, and GD sedan/wagon listings can also differ. Many older products are special-order, discontinued, or sold through marketplace listings, so this section is a chassis-shopping guide rather than a universal one-click recommendation.
| Pick | Best for | Sound | Fitment note |
|---|---|---|---|
| COBB 3 Inch | Refined older street builds | Deep, restrained | Verify exact GD/GR/GV body style |
| Invidia Q300 | Quieter daily use | Mild to moderate | Sedan/hatch applications differ |
| Invidia N1 | Loud single-exit setup | Loud | Adapter and body-style fitment can matter |
| HKS Hi-Power/Super Turbo | Premium JDM-style build | Varies by model | Confirm part number and road-use notes |
COBB is the safest starting point for older WRX/STI owners who want a refined exhaust rather than the loudest one available. COBB has offered 3 inch WRX/STI catbacks across several older sedan and hatch applications, and owner sentiment around COBB exhausts tends to emphasize fitment, a deeper note, and less irritating drone than many louder systems.
The shopping warning is availability. Older COBB exhausts may be discontinued, backordered, or split by body style, so treat the product page or retailer listing as a fitment lookup rather than assuming any COBB WRX catback fits your car.
Buy if: you want a refined older WRX/STI exhaust and can find the correct COBB fitment.
Skip if: you want the loudest sound per dollar or cannot verify exact body-style compatibility.
The Invidia Q300 is the older-chassis quiet recommendation for the same reason it works on VA cars: owners repeatedly use it as the livable alternative to louder N1/R400-style setups. That does not mean it is silent. NASIOC owner feedback on older hatch applications still mentions highway drone in the 2,500-3,500 rpm range for some cars, so do not treat “quiet” as “drone impossible.”
Buy if: you want an older WRX/STI catback that leans daily-friendly.
Skip if: you want a raw single-exit sound or you cannot verify the exact sedan/hatch part number.
The Invidia N1 is the common older WRX/STI loud path. Owner feedback varies by chassis and downpipe, but the broad pattern is clear: people buy the N1 because they want more sound, a rawer tone, and a more aggressive exhaust personality than Q300-style systems.
Plan for fitment details. Some cars need adapters when pairing an aftermarket catback with the stock downpipe, and hatch/sedan routing must match.
Buy if: you want an aggressive older WRX/STI exhaust and accept more cabin volume.
Skip if: you commute long distances and already know drone bothers you.
HKS is the premium older-chassis path when you want Japanese-brand build quality and can confirm the exact application. HKS lists several GD and GR/GV WRX STI exhaust applications with different muffler types, pipe diameters, and noise levels. That variety is useful, but it also means you need to shop by part number instead of by brand name alone.
Buy if: you want a premium older WRX/STI exhaust and are willing to verify part-number fitment.
Skip if: you want the simplest one-click affiliate option.
WRX Catback Sound And Fitment Guide
A catback usually does not require a tune. It installs behind the catalytic converter and oxygen sensors, so it does not change MAF scaling or catalyst monitoring the way an intake or j-pipe can. COBB’s VB catback Q&A also states that a catback does not require additional tuning. If you install a j-pipe/downpipe, turbo, headers, or fueling parts, that is a different conversation.
VB, VA WRX, and VA STI exhausts do not interchange cleanly. Shop by exact year, chassis, body style, transmission notes, and engine. A “2015+ WRX” listing may not mean 2022+ VB WRX.
Older WRX generations need separate fitment checks. This guide is focused on the 2015+ cars because that is what the original article and URL cover. GD, GR, and GV WRX/STI exhausts are different shopping paths, and sedan/hatch differences matter. Do not buy an older WRX catback from a broad marketplace listing unless the exact chassis and body style match.
Resonators matter. If an exhaust offers resonated and non-resonated versions, the resonated version is usually the safer daily-driver recommendation. Non-resonated systems can sound sharper and louder but may add highway drone.
Muffled and non-muffled are not the same as resonated and non-resonated. A muffler controls overall volume and tone. A resonator targets certain frequencies. Some catbacks let you choose both.
A j-pipe changes the whole sound profile. A catback that is livable with the stock downpipe can become too loud after a high-flow catted j-pipe. If you plan to modify the front half of the exhaust, buy the catback with that future setup in mind. Also read the current WRX downpipe guide and WRX stage 2 setup guide before assuming an older downpipe path is still the best idea after COBB Project Green Speed.
Axlebacks are cheaper but less complete. An axleback exhaust replaces the rear section only. It can be a good budget sound mod, but a catback gives you the midpipe/resonator path and more control over tone.
A catback is usually an exhaust/noise mod before it is a power mod. If you are planning a complete Subaru WRX stages path, the catback should match the rest of the car: intake, intercooler, downpipe/j-pipe decisions, and tune path. For engine-specific context, see the FA20DIT guide and EJ25 guide.
Do not judge only by short rev clips. Parking-lot rev videos exaggerate the wrong things. Look for 65-75 mph cruising clips, in-cabin footage, cold start, uphill load, and cars with the same downpipe/j-pipe as yours.
Common WRX Catback Mistakes
Buying the loudest exhaust first: many owners end up selling loud single-exit or non-resonated systems after the novelty wears off.
Ignoring future mods: a quiet catback can become moderate with a j-pipe, and a moderate catback can become harsh.
Assuming VB and VA parts fit each other: they do not. The 2022+ WRX is its own fitment category.
Mixing modular parts from different layouts: some brands use different flange angles or routing between axleback/midpipe kits and complete catbacks.
Forgetting local noise rules: a catback may be emissions-safe from a tuning standpoint, but noise enforcement is separate.
FAQ
What is the best WRX catback exhaust overall?
For a 2022+ VB WRX, the AWE Touring is the best overall daily-driver recommendation. For a 2015-2021 VA WRX, the Invidia Q300 is the safest all-around pick. For a 2015-2021 VA STI, the HKS Hi-Power Spec-L II is the best refined lightweight pick.
Does a WRX catback add horsepower?
Usually not much by itself. A catback can reduce restriction and support future power mods, but the main guaranteed gains are sound, appearance, and sometimes weight reduction. Be skeptical of large horsepower claims unless the dyno setup and supporting mods are clearly shown.
Do you need a tune for a WRX catback?
No, not for a normal catback that keeps the factory catalytic converter and sensors in place. You need to think about tuning when you change the intake, j-pipe/downpipe, turbo, fueling, or other parts that affect measured airflow, catalyst monitoring, or boost behavior.
Is a WRX catback legal in California?
A catback does not replace the catalytic converter, but California and other states can still enforce noise limits and other equipment rules. Avoid vague “CARB legal exhaust” assumptions. CARB approval is especially important for catalytic converter and emissions-control parts, while catbacks still need to satisfy local sound laws.
Is a catback louder than an axleback?
It depends on the parts. A muffler-delete axleback can be louder than a resonated/muffled catback. A non-resonated catback can be louder and fuller than many axlebacks because it changes the midpipe and resonator section too.
Will a catback void my WRX warranty?
A catback alone is usually a lower-risk modification than a downpipe or tune, but warranty outcomes depend on the failed part, dealer, manufacturer policy, and local law. Keep the stock exhaust if you may need to return the car to stock.
What is the quietest WRX catback?
For the VA WRX and STI, the Invidia Q300 is the common quiet daily-driver recommendation. For the VB WRX, start with AWE Touring, Borla S-Type, or a resonated/muffled ETS or Remark setup rather than a Track, Extreme, or single-exit exhaust.
What is the loudest WRX catback?
Single-exit titanium systems like the Tomei Expreme Ti and non-resonated/track-style systems are usually the loud choices. They can be fun, but they are not the default recommendation for a daily driver.
Does the 2022+ VB WRX use the same exhaust as the 2015-2021 WRX?
No. The VB WRX uses different fitment than the VA WRX. Shop by exact year and chassis, not just by “WRX” in the product title.
Is the Invidia Q300 quieter than the R400?
Yes, that is the usual owner-feedback pattern. The Q300 is the safer quiet daily-driver choice, while the R400 is louder and more aggressive. Drone tolerance depends on the rest of the exhaust, especially j-pipe/downpipe changes.
Bottom Line
Choose by chassis first, then sound tolerance. A 2022+ VB WRX owner should start with AWE Touring, COBB SS, Borla S-Type, ETS, PERRIN, or Remark depending on budget and drone tolerance. A 2015-2021 VA WRX owner should start with Invidia Q300 for quiet daily use, GrimmSpeed or Borla for current stainless alternatives, R400 for more aggression, Tomei for lightweight volume, or COBB titanium for a premium build. A 2015-2021 VA STI owner should consider HKS Spec-L II for a refined lightweight setup, Q300 for daily use, R400 for a louder quad-tip system, or Tomei for the single-exit route.