Cobb Project Green Speed did not kill WRX tuning, but it permanently changed what a normal Accessport build looks like. The old path of installing an aftermarket j-pipe, flashing an off-the-shelf Stage 2 map, disabling emissions-related codes, and moving on is no longer the current COBB-supported path.
The short version for 2026:
- The Cobb Accessport still works and is still the main tuning device for many WRX owners.
- End-user Accesstuner is no longer available.
- COBB OTS maps are built around specific, supported parts lists.
- COBB says its Accessports and OTS maps do not work with aftermarket downpipes.
- Current COBB Stage 2 packages for VA and VB WRXs are built around intake/cooling/boost-control parts while retaining factory catalytic hardware.
- Flex fuel is back for supported WRX applications through newer CAN-based hardware, not the old analog input style.
- The EPA settlement in 2024 made the compliance side more explicit: COBB can continue selling tuners and software that have emissions support such as CARB Executive Orders or accepted emissions testing.
This article is not legal advice. Emissions rules vary by state, inspection type, and vehicle use. Treat it as a practical WRX tuning guide for what changed and what you should verify before buying parts.
On this page
- What Is Project Green Speed?
- What Changed After The EPA Settlement?
- Does The Cobb Accessport Still Work?
- Can I Still Use Accesstuner?
- Can I Still Install A Downpipe Or J Pipe?
- What About Catless Downpipes?
- What Happened To WRX Stage 2?
- Can I Still Use Flex Fuel?
- What Can Tuners Still Tune?
- What Parts Are Still Safe To Buy?
- What Should Current WRX Owners Do?
- FAQ
- Bottom Line
What Is Project Green Speed?
Project Green Speed is COBB’s move toward emissions-compliant hard parts, calibrations, and tuning workflows. COBB framed the change as an effort to keep delivering performance parts while satisfying EPA and CARB requirements.
For WRX owners, the change mostly shows up in four places:
| Area | Old expectation | Current practical reality |
|---|---|---|
| Downpipes / j-pipes | Common Stage 2 upgrade with OTS maps | COBB no longer supports aftermarket downpipes with current OTS maps |
| DTC deletes | Tuners often disabled emissions-related codes | Emissions-related code disabling is restricted |
| Flex fuel | Analog kits used existing ECU inputs | New COBB kits use CAN-based hardware |
| Stage packages | Stage 2 often meant j-pipe | COBB Stage 2 now usually means supported intake/cooling/boost hardware with factory cats |
The major buyer mistake is assuming a 2018 forum recipe still applies. It might physically bolt on, but that does not mean there is a current supported map, warranty support, technical support, or inspection-friendly path.
What Changed After The EPA Settlement?
In September 2024, the EPA and Department of Justice announced a Clean Air Act settlement with COBB. The EPA said COBB had to stop manufacturing and selling defeat-device products, remove delete features from software, stop support and warranty handling for violative products, and pay a civil penalty. The EPA also said COBB may continue selling tuners and software tunes that have been evaluated, shown not to increase emissions above allowable levels, and received CARB Executive Order coverage where required.
COBB’s own settlement FAQ says the Accessport itself was not identified as a subject product and that current Accessport functionality remains available. The practical impact is not “Accessports are gone.” It is that COBB’s supported tuning ecosystem is now narrower and more compliance-driven.
For a WRX owner, that means:
- Do not expect COBB to provide a map for an aftermarket downpipe.
- Do not expect warranty or support for old discontinued COBB downpipe products.
- Do not expect a tuner to disable catalyst, rear O2, TGV, EGR, or other emissions-related codes through current COBB software.
- Do expect current COBB maps to be tied closely to exact parts lists.
Does The Cobb Accessport Still Work?
Yes. The Accessport still works for supported vehicles. It can still flash supported OTS maps, monitor ECU data, read and clear codes, datalog, and load custom maps from COBB Protuners where supported.
What changed is not the basic Accessport device. The bigger changes are:
- Old unsupported maps were removed or replaced.
- Some preloaded map availability changed.
- End-user Accesstuner is no longer offered.
- Custom tuning has to happen through supported professional channels.
- Maps and parts now have stricter compatibility requirements.
If you are buying a used Accessport, the old warning still applies: make sure it is unmarried/uninstalled from the prior car and that the part number matches your exact WRX application.
Can I Still Use Accesstuner?
Not as an end user. COBB’s current support FAQ says Accesstuner is no longer available for end users as of April 2022.
If you need a custom tune, the normal COBB path is to work with a Protuner. That matters because a lot of older WRX build guides were written when owners could still use, download, or discuss Accesstuner in a different way. Do not plan a current build around personally editing COBB maps unless you already have legitimate professional access and know the current rules.
Can I Still Install A Downpipe Or J-Pipe?
Physically, yes, aftermarket downpipes and j-pipes still exist. Practically, this is where Green Speed changed the most.
COBB’s current support FAQ says none of its Accessports or OTS maps will work with an aftermarket downpipe, and recommends using the factory/OEM downpipe or an OE-equivalent downpipe if you want to safely use the Accessport on supported maps.
That means old advice like “install a j-pipe and flash the COBB Stage 2 map” is stale for current COBB-supported WRX tuning. A j-pipe build should now be treated as a custom-tuned path where you talk to the tuner before buying parts.
For more detail on how this affects product choices, see our updated WRX Stage 2 kits guide.
What About Catless Downpipes?
Do not treat catless downpipes as a normal street-car option. They create legal, inspection, emissions, smell, noise, boost-control, and check-engine-light problems, and current COBB software is not built around disabling the related emissions monitors.
Older ThinkTuning downpipe content still exists on the site, but the Green Speed update is exactly why those pages are in the update queue. Until they are refreshed, treat any old catless/downpipe recommendation as outdated context, not current street-car guidance.
What Happened To WRX Stage 2?
Stage 2 did not disappear. It changed meaning depending on who is using the phrase.
For current COBB-supported WRX packages:
- The 2015-2021 VA WRX NexGen Stage 2 route uses parts like an Accessport, intake, top-mount intercooler, charge pipe, and boost-control solenoid while retaining the factory j-pipe.
- The 2022+ VB WRX Stage 2 route uses parts like an Accessport, intercooler, charge pipe, intake tube, and high-flow filter while retaining factory catalytic hardware.
For non-COBB or shop-built packages, Stage 2 may still mean an intake, intercooler, catted j-pipe, and custom tune. That can make more power, but it is not the same as COBB’s current OTS-map path.
The safe rule: choose the tune path first, then buy the exact parts required by that tune.
Can I Still Use Flex Fuel?
Yes, and this is one of the biggest updates since the original 2022 version of this article.
At first, Project Green Speed effectively broke the old WRX flex-fuel path because the older kits used existing analog ECU inputs, such as TGV or rear O2 related inputs. Those were emissions-related inputs, which made them a problem under the updated tuning rules.
COBB has since released CAN-based flex-fuel hardware for supported Subaru applications:
- COBB announced CAN Flex Fuel for the 2015-2021 Subaru WRX in January 2026.
- COBB’s Subaru flex-fuel landing page also lists 2022-2025 WRX CAN Flex Fuel packages and upgrades.
- COBB says these systems use CAN Gateway hardware and supporting maps rather than the old analog-input approach.
- COBB lists some packages as 49-state or pending California status until CARB EO coverage is complete, so California buyers need to verify current legality for the exact part number.
This means our older WRX flex fuel guide also needs a full refresh. The old workaround of separate ethanol maps is no longer the complete answer for supported WRX applications.
What Can Tuners Still Tune?
COBB Protuners can still tune supported vehicles, but they have to work within the current software and emissions rules. Current COBB support language points owners toward the Protuner network for custom tuning when a COBB OTS map does not exist for a configuration.
Owners who want a more technical, laptop-based alternative can compare the current WRX open-tuning options for VA and VB cars, including Atlas support, compatible adapters, and the differences from an Accessport workflow.
For a practical WRX owner, ask the tuner these questions before buying parts:
- Is this exact parts list supported through COBB software today?
- Will any emissions-related DTCs need to be disabled?
- Will the car keep readiness monitors happy for my inspection environment?
- Is the part legal for sale and use in my state?
- Do I need a CARB EO sticker, SEMA certification, or other documentation?
- Is this a pump-gas tune, flex-fuel tune, ethanol-content tune, or race-use setup?
If the answer depends on disabling emissions equipment, rethink the build.
What Parts Are Still Safe To Buy?
The safest parts are the ones that have a current supported map or are clearly tune-independent.
Usually safer:
- COBB Stage packages for your exact year/transmission
- Parts listed directly in the map notes for your exact OTS map
- Catback exhausts and axlebacks
- Suspension, brakes, wheels, tires, shifter parts, and other non-emissions mods
- CAN Flex Fuel kits when they match your application and legal environment
Needs more diligence:
- Intakes not matched to a supported map
- Intercoolers not matched to a supported package
- Boost-control solenoids not matched to a tune
- Turbo inlets, headers, and turbo upgrades
- Any j-pipe/downpipe
- Used parts from discontinued COBB packages
Bad street-car assumptions:
- Catless exhaust parts
- TGV/EGR deletes
- “Just clear the code” tuning
- Random Stage 2 bundles with no tuner lined up
What Should Current WRX Owners Do?
If your car is stock:
Start with a supported Accessport/Stage 1 path or a complete COBB package for your exact WRX. Do not buy airflow parts first and ask about tuning later.
If your car already has an old j-pipe tune:
Keep careful records of your parts list, tune source, and Accessport state. If you need revisions, a new tune, emissions inspection, or a dealer visit, talk to a competent Subaru tuner before changing firmware, uninstalling parts, or assuming the old map can be updated.
If you are buying a used modified WRX:
Be cautious. Ask for the parts list, tune source, Accessport, datalogs, emissions readiness status, and whether the factory j-pipe/downpipe is included. A “Stage 2” listing can mean anything from a clean supported COBB package to an old unsupported downpipe setup.
If you live in California:
Verify CARB EO status by exact part number. Do not assume “catted,” “GESi,” “EPA compliant,” “49-state,” or “tested” means California legal.
FAQ
Did Project Green Speed kill WRX tuning?
No. It changed the upgrade paths. WRX owners can still tune with supported Accessport maps, COBB packages, CAN Flex Fuel kits, and Protuner calibrations. The unsupported delete/downpipe/code-disabling era is what changed.
Can I still run a COBB Accessport on my WRX?
Yes, if your WRX is supported by the correct Accessport part number and you use maps that match your vehicle and parts.
Can COBB send me a map for an aftermarket downpipe?
COBB’s current support FAQ says its Accessports and OTS maps do not work with aftermarket downpipes. If you have a downpipe or j-pipe build, talk to a Subaru tuner before flashing anything.
Is flex fuel back for the WRX?
Yes, for supported applications. COBB has CAN Flex Fuel options for 2015-2021 WRX and lists CAN Flex Fuel packages for 2022-2025 WRX. Verify exact model year, transmission, map notes, and state legality before ordering.
Can I still pass emissions with a modified WRX?
Maybe. It depends on your state, parts, tune, readiness monitors, and whether required emissions hardware remains in place. Current COBB packages with proper emissions coverage are the simplest path, but you still need to verify your exact setup.
Is a catted j-pipe legal?
Not automatically. A high-flow catalyst does not by itself prove legality for every state or inspection environment. California buyers especially need exact CARB EO coverage.
Bottom Line
Project Green Speed did not end WRX tuning. It ended the casual assumption that emissions equipment can be changed, codes can be disabled, and old OTS maps will cover it.
The best current WRX tuning strategy is simple: pick a supported map or a reputable tuner first, then buy the exact parts that path requires. For many owners that means a current COBB Stage package, a CAN Flex Fuel package, or a carefully planned custom tune rather than the old j-pipe-first Stage 2 formula.