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Learn how EcuTek tuning works on supported Subaru WRX models, what the license and interface do, and how EcuTek compares with a COBB Accessport or Atlas.

Diagnose Subaru WRX misfire codes P0300, P0301, P0302, P0303, and P0304 by engine generation, symptom pattern, and modification history before replacing parts.

Plan Subaru WRX suspension upgrades in the right order, from tires and alignment to dampers, springs, sway bars, control arms, bushings, chassis braces, and rough-road ride height.

Compare a WRX top-mount and front-mount intercooler by cooling consistency, response, pressure drop, installation, fitment, and tuning needs.

A WRX bypass valve recirculates metered air; a blow-off valve vents it. Learn why a full-recirculating BPV is the right choice for most MAF-based WRX builds.

Automatic WRXs span the 4EAT, Sport Lineartronic CVT, and SPT. Match the model year to the right transmission, diagnosis, and used-car checks.

Plan Subaru WRX modifications in the right order with separate daily-driver, handling, power, and track paths for the VA WRX, VB WRX, and VA STI.

Learn the common Subaru WRX and STI problems by chassis, engine, and model year, including what symptoms mean and what to inspect before buying.

Shopping for a used Subaru WRX or STI? Compare generations, transmissions, modifications, inspection priorities, repair reserves, and the red flags that should end the deal.

Learn how Subaru WRX all-wheel drive differs between manual, CVT, SPT, and STI models, including center differentials, VTD, DCCD, and torque vectoring.

The 2008, 2012-2014, and 2015-2018 Subaru WRX model years have documented issues that deserve specific checks before you buy.

Compare Subaru FA24F and FA24D engines, including specifications, vehicle applications, fuel systems, turbocharging, reliability, and replacement-engine compatibility.

Identify the engine in a Subaru WRX or STI, compare the EJ205, EJ255, EJ257, FA20DIT, and FA24DIT, and find the right reliability, maintenance, and diagnostic guide.

Plan Subaru WRX maintenance costs by generation, engine, transmission, mileage, and modifications without confusing routine service with repair risk.

STI stands for Subaru Tecnica International. Learn what the company does and why an STI badge can identify a complete car, a tuned model, or a performance part.

Learn what EJ255 and EJ257 ringland failure feels like, what usually breaks the piston, how to test for damage, and what to do before a small crack becomes engine damage.

WRX stands for World Rally Experimental. Learn where Subaru's WRX name came from and how WRX differs from Impreza, STI, and WRX STI.

Learn where Subaru used the EJ205, how USDM and JDM versions differ, what to inspect on an older engine, and what matters when buying a replacement.

Learn how a Subaru WRX dyno tune works, from the pre-tune inspection and baseline pull through ECU changes, validation, cost, and the final dyno graph.

Compare a Subaru WRX e-tune with an in-person dyno tune by process, safety, cost, power, drivability, and fit for VA, VB, and STI builds.

Learn how a Subaru WRX e-tune works, including base maps, Accessport datalogs, map revisions, required equipment, completion time, and safety.

Learn how to diagnose clutch slip, chatter, throwout-bearing noise, pedal problems, and transmission symptoms on a 2015-2021 Subaru WRX, plus realistic replacement-cost planning.

Learn the warning signs of EJ257 rod-bearing failure, how rod knock differs from normal Subaru noises, what tests can confirm the problem, and when to stop driving.

Learn what is known about RTV sealant debris and the FA24 oil pickup in the 2022+ Subaru WRX, what symptoms matter, how the system is inspected, and whether buyers should be concerned.

Compare the 2015-2021 VA Subaru WRX with the 2022+ VB WRX by engine, transmission, AWD, handling, interior, reliability, tuning, and used-car value.

A practical FA24DIT reliability guide for the 2022+ VB Subaru WRX, covering oil use, carbon deposits, heat, clutch and transmission concerns, tuning risks, and what is actually known.

Find the correct Subaru WRX transmission fluid, gear-oil capacity, and service interval for VA, VB, EJ, manual, CVT, and SPT cars.

Learn how to recognize Subaru WRX boost leak symptoms, find common FA20DIT and FA24DIT leak points, and pressure- or smoke-test the system before blaming the tune.

Compare the Subaru WRX and WRX STI by horsepower, 0-60 times, fuel economy, engine, transmission, AWD system, brakes, ownership cost, and daily-driver comfort.

How reliable is the Subaru WRX? Compare EJ, FA20, and FA24 generations, common problems, modified-car risks, maintenance priorities, and the checks that matter before buying.

Learn when a 2015-2021 Subaru WRX needs walnut blasting, what carbon buildup does to FA20DIT intake valves, how the service works, what it costs, and whether DIY cleaning is worth the risk.

Learn what alignment changes after lowering a Subaru WRX, when you need rear camber or toe correction, and how to choose street-friendly settings for VA, VB, STI, and older EJ cars.

Compare the best Subaru WRX wheels for street, track, value, and rally builds, with VA, VB, and STI sizes, offsets, tires, and brake-clearance guidance.

A practical FA20DIT reliability guide for the 2015-2021 VA Subaru WRX, including carbon buildup, knock, boost leaks, oil consumption, tuning risks, and inspection advice.

Learn how open tuning works on the VA and VB Subaru WRX, including Atlas, compatible cables, ECU flashing, datalogging, COBB differences, and safety limits.

Use this Subaru WRX and STI maintenance schedule to plan oil changes, fluids, spark plugs, inspections, timing-belt work, and drivetrain service by generation.

COBB Project Green Speed changed WRX downpipe support, DTC deletes, flex fuel, and Stage 2 packages. Learn what still works in 2026.

The BMW B58 powers a wide range of BMW cars, as well as the Toyota Supra. We've got everything you need to know about this legendary engine here.

Looking to keep your 370Z, G37, or other VQ37VHR equipped car running like new? Want to buy a car with this legendary engine? Here's what you need to know.

If you're looking to keep your 350Z or G35's engine in top shape, or thinking of buying a car with with a VQ35DE, then we've got everything you should know.

Looking to buy an EJ25 powered Subaru, or just keep yours running in top shape? We've got everything you need to know.

Learn about the Subaru FA20 engine's specifications, naturally aspirated and turbocharged variants, applications, and key differences across Subaru, Toyota, and Scion models.

The best WRX brake upgrade depends on your chassis and use case. Here are the best street, track, and big brake picks for VB, VA, and Brembo-equipped WRXs.

If you want to keep your Subie running great for a long time, it's important you use the right motor oil. Not all oils are created equally. It's important not only to use synthetic oil, but make sure the oil has the right certifications, such as API SN, SN PLUS, or SM . If you want to ensure a longer engine life for your car, proper maintenance with the right supplies is important.

The best WRX top mount intercooler depends on whether you have a VB or VA WRX. These are the best TMIC picks for street, stage 2, and heat-soak control.

The best Subaru Crosstrek lift kit depends on generation, tire size, daily ride quality, alignment needs, and whether you want spacer lift, premium overland hardware, or lift springs.

The best Subaru Crosstrek tire depends on whether you want quiet daily comfort, one-set snow capability, light-trail all-terrain grip, or dedicated winter traction.

If you're looking to get the most out of your Nissan 350Z, tires are the first place you should start. While it's tempting to install other mods for better performance, tires are the final piece that puts the power to the pavement. If you can't get enough traction to put the torque down, you're losing power to wheel spin. Choosing the right tires for your driving conditions will help your car to handle and perform at its very best.

The best 350Z and G35 coilovers depend on whether you drive a Z33, G35 coupe, G35 sedan, daily street car, stance build, or track car. This guide separates fitment, true-rear costs, and current product picks.

The best Nissan 350Z exhaust depends on how you use the car. Here are the cat-back and y-pipe-back systems that make sense for daily drivers, loud single-exit builds, premium street cars, and budget projects.

While the Subaru BRZ, Scion FR-S, and Toyota 86 may have a decent enough interior, most people would appreciate some extra little comforts or just some personalization.

The best coilovers for a BRZ, FR-S, Toyota 86, or GR86 depend on generation, ride-height goals, tire grip, and street-versus-track use. This guide covers 2013-2020 ZC6/ZN6 and 2022+ ZD8/ZN8 fitment, quick picks, product cards, owner-review themes, and setup notes.

The best 370Z and G37 coilovers depend on whether you drive a 370Z, RWD G37, or G37x AWD. This guide separates daily, budget, rebuildable, and track-focused picks with current fitment notes.

The best Nissan 370Z exhaust depends on whether you want a daily-friendly tone, a loud single exit, a premium true dual, or a budget axle-back. Here are the systems worth shortlisting in 2026.

If your Subaru WRX, WRX STI, Forester XT, or other turbocharged model is tuned and you have a Cobb AccessPort, you probably monitor some parameters related to knock, or at least have heard that you should. While many owners are worried when they see any knock, this isn't always a concern. In this article, we'll explain how Subaru's knock control system works, and how the various parameters are related.

The Nissan 370Z is a very well handling and capable sports car. However, just like any car, it's only as good as the tires. Your tires are the final piece of the car, where all of the power and driver input must go through. It's often overlooked by some drivers, but you need quality tires and the right ones for your driving conditions to get the most out of your car. While many enthusiasts install an exhaust as their first mod, tires are really the most important.

Installing a shift knob is a great way to personalize your car's interior, and one of the easiest mods for your BRZ to install. Not only can you pick something unique that looks good to you, but with a weighted shift knob, your shifter will glide from gear to gear with ease. These shift knobs fit Subaru BRZ, Scion FR-S and Toyota 86, and are easy to install in minutes. We've compiled a list of our favorites below.

The best BRZ, FR-S, 86, and GR86 supercharger kit depends on generation, emissions requirements, tuning support, and power goals. Here are the current first-gen FA20 and second-gen FA24 kits worth shortlisting.

The best BRZ, FR-S, Toyota 86, and GR86 tires for summer driving, year-round use, winter weather, autocross, and track days.

The best dual action polisher depends on whether you need a safe beginner machine, a complete starter kit, a faster long-throw polisher, or a compact tool for tight panels.

The best rubbing compound depends on whether you need safe beginner correction, heavy cut, a one-step compound and polish, or budget oxidation removal.

The best polishing compound depends on whether you need a beginner gloss polish, a one-step correction product, a finishing polish, or a machine-focused pro polish.

The best rinseless and waterless car washes depend on whether you need a true bucket wash, a ready-to-use spray, a coating-friendly topper, or a wash-and-wax shortcut.

The best WRX exterior mods depend on chassis, fitment, and how permanent you want the change to be. This guide covers VA WRX/STI and VB WRX exterior upgrades, including mud flaps, front lips, rear fog lights, plate relocation kits, overlays, rain guards, and carbon trim.

The best spray sealant depends on whether you want long ceramic-style protection, a drying aid, a glossy topper, or a quick spray wax after each wash.

The best microfiber towel for your car depends on the job: drying, rinseless washing, wax removal, polish removal, glass cleaning, interior work, or dirty lower panels.

The best WRX front lip depends on chassis, bumper, material, and how much scraping risk you can tolerate. This guide covers VB WRX, VA WRX, and VA STI front lip options.

The best WRX lowering springs depend on chassis, drop height, damper condition, alignment budget, and whether you have a VB WRX, VA WRX, VA STI, or older GR/GV WRX/STI.

The PERRIN shift stop removes much of the side-to-side play in the VA WRX shifter, while the brass cable bushing makes each shift feel more solid.

The right Fumoto valve for a Subaru WRX depends on engine family and oil-pan fitment. This guide covers F108SX and F108S for FA-series WRX models, F105-series valves for EJ WRX/STI models, install notes, clearance risks, safety clips, and leak checks.

The best WRX AOS or catch can depends on whether you have a VB FA24, VA FA20, or EJ-powered WRX/STI. Here are the best current air oil separator and catch can picks.

The best Subaru WRX tire depends on climate and use: summer performance, ultra-high-performance all-season, all-weather, winter, or 200TW track/autocross tires.

The best Subaru WRX mud flaps depend on chassis, clearance, material stiffness, and whether you want rally style or subtle paint protection. This guide compares Rally Armor, RokBlokz, OEM splash guards, and budget alternatives for VB, VA, STI, and older WRX fitment.

The best WRX Stage 2 kit depends on whether you have a 2015-2021 VA WRX or a 2022+ VB WRX, and whether you want a compliant stock-cat package or a custom-tuned j-pipe build.

Best WRX coilovers for VB, VA, GR/GV, and GD chassis cars. We break down fitment by generation and compare the strongest coilover options for daily driving, spirited road use, and serious performance.

The best Subaru WRX shift knobs depend on chassis, material, weight, and reverse-lockout fitment. This guide covers 2022+ VB WRX, 2015-2021 VA WRX/STI, older 2002-2014 WRX/STI fitment, and what to avoid before buying.

The best Subaru WRX interior mods make the cabin easier to live with and more satisfying to drive. This guide covers VA WRX/STI and VB WRX interior accessories, including shift knobs, floor mats, shifter upgrades, cup holder liners, LED lighting, trim, storage, and CVT-specific picks.

The best BRZ, FR-S, Toyota 86, and GR86 exhaust depends on generation, sound goals, and whether headers are next. Here are the street, loud, premium, and budget picks worth shortlisting.

WRX flex fuel is back through COBB CAN Flex Fuel for supported VA and VB WRXs. Here is what changed after Green Speed, which kits fit, and what to verify before running ethanol.

The best BRZ, FR-S, 86, or GR86 turbo kit depends on generation, emissions requirements, power target, tuning support, and supporting-mod budget. Here are the current kits worth shortlisting.

The best WRX catback exhaust depends on whether you have a GD, GR/GV, VA, or VB WRX/STI, and how much sound and drone you can live with.

The best 2015-2021 WRX j-pipe depends on your tuning path, emissions rules, and transmission. Here is the current catted downpipe guide after COBB Green Speed.

Learn what WRX Stage 1, Stage 1+, Stage 2, Stage 2+, and Stage 3 mean after COBB Project Green Speed, including VA, VB, STI, CVT, and custom-tune differences.

The best WRX axleback depends on chassis, muffled vs muffler-delete sound, drone tolerance, and whether you have a 2022+ VB WRX or 2015-2021 VA WRX/STI.

The best WRX intake depends on whether you have a 2022+ VB or 2015-2021 VA WRX, and whether you want an OTS-supported, CARB-friendly, or custom-tuned setup.