Cobb Green speed EPA regulations update tuning modified Subaru's.

Update April 2023: The all new Cobb NegGen Flex Fuel packages are in stock and shipping out daily. The new Cobb Flex Fuel Kits cover all 2015-2021 WRX STI’s and allow us to custom tune for any blend of gasoline/ethanol based fuels. This means you can fill up with E85, flex fuel, E10, E20 or normal gasoline and drive away smooth as butter thanks to the Flex Fuel sensor and custom Flex Fuel E-tune aka Pro-tune.

April 18th 2022: Cobb changed everything. Long story short Cobb Tuning removed a some of their software functionality related to emissions equipment per EPA regulations and the software is now more limited, only supporting the areas allowed by the EPA. While the new software update limits some features we are still tuning Cobb AP daily and making great reliable power! Cobb has also just released the new NexGen flex fuel kits linked above among other high performance parts that all fit within the EPA’s new regulations. We proudly offer special pricing for all returning customers making updated modifications to best utilize the new Cobb AP abilities and Cobb’s green speed program. We fully support the Cobb Green Speed program and are excited to be tuning efficient, powerful and CLEAN Subaru’s using the Cobb AP and our Etune services. 

cobb ap etune sti

We of course are here to support you with you Cobb AP or any other engine management system you choose to use. For those building competitive race cars; We normally use full Motorsports grade ECU packages such as: Plug n Play Motec M150 ecu package 08+ sti as well as plug and play Haltech ecu package and Emtron ECU plug n play ECU kits for race cars looking to maintain functions like flex fuel but also add motorsports controls and engine safety strategies. Again we are also continuing support for cobb AP with Etunes and live tuning. For those using Cobb you will be forced to stay with the limitations of new Cobb Green speed update. Not to fear though, we are making great power with WRX and STI’s fully equipped with all emissions equipment including OEM downpipe!

Below are just a few of our most popular and race proven STI, WRX parts and packages along with a special coupon code to help you save some $ on your next order. Please note we are proudly offering all of Cobb Tunings latest products including EPA/CARB approved intakes and exhausts for all turbo Subaru applications. If you need help modifying your car to get back into compliance with the green speed initiative please don’t hesitate to contact us, we are happy to supply any aftermarket OR OEM Subaru parts you need. 

  • STI & WRX E-tune: Cobb AccessPort, custom tune for any WRX or STI on AP. Bolt on mods to fully built race cars supported using the Cobb Green Speed Updated software.
  • Subaru WRX and STI Haltech Elite ecu packages: VE plug n play adapter harness delivers a clean/simple plug n play harness to adapt your EJ25 powered Subaru to run the Haltech Elite 2500 ECU. 
  • Subaru STI Motec M150 ecu kit: Plug n Play harness + ECU using the best motorsports grade ECU available. If you have a serious build this is the ECU package for you.
  • STI EMtron ECU packages: Please give us a call for the latest Emtron ECU packages and pricing. These all NEW plug n play kits for 2015+ sti are not yet listed for sale on our website so you will need to call or email.**
  • STI Link ECU Plug and Play for 2007-2011 USDM STI & WRX using Denso ecu. 
  • Cobb Tuning Carbon Fiber intake for 2015-2022 STI, Cobb Redline series

cobb carbon fiber intake

  • AEM 150psi fuel pressure sensor (Engine safety feature, allows ECU to compensate for drop in fuel pressure or oil pressure. Same sensor used for oil or fuel pressure.)
  • 3 port boos solenoid (ebcs allows ECU to control boost target, very important for engine safety and protection features) 
  • AEM X series AFR gauge (used to provide a wideband AFR signal to the ECU for accurate tuning, CANbus and Analog outputs with LED display). 
  • ID1050x STI (Injector Dynamics 1050cc for WRX and STI, same injectors as Cobb)
  • ID1300x STI (Injector Dynamics 1300cc for WRX and STI, same injectors as Cobb)
  • AEM in tank high flow fuel pump (e85/ethanol safe, same pump used in Cobb fuel system packages)
  • Haltech tune (For those using our Haltech elite ECU packages.) 
  • Motec tune Once all parts are installed we can provide a full custom E-tune for any build, mild to wild. All Etunes are done through emailing data logs and calibration revisions. 
  • Get $50 off any Injector Dynamics order with coupon code: hohu50
  • Get $100 off any ECU + Dash with coupon code: hohu100


Those planning to continue to use the Cobb AP will need to re install all OEM emissions equipment including TGV’s, secondary air pump and EGR. Please note while most people remove these parts there is actually NO need to do so. Non of these emission related items hurt or effect engine performance they are simply there to help keep the emissions low under normal use like idle and cruising conditions. 
If you need any help getting an OEM or aftermarket part for your Subaru don’t hesitate to contact us, we are here to help you get the most out of your Subi all while staying within the guidelines set by the EPA keeping you safe and our air clean.  

Injector Dynamics Sizing Subaru WRX and STI:

If you have any questions or requests please do not hesitate to contact us. We are here to support you with your build, from parts to tuning support and data analysis we can help you get your car running perfectly. For those building an EJ25 powered STI check out our tech article: Best Mods for the STI and for those building a 2015+ WRX check out our FA20dit engine specific article here: Subaru WRX Best Modifications.

6 thoughts on “Cobb Tuning Green Speed update: How to tune a Subaru now?

  1. Jesse Hickle says:

    Hello I’m looking to take my 04 sti back to stock or go all out haltech system sense my access port isn’t much use for now. It currently has a full straight pipe. Blousch 3.0 dom. Perrin frontmount. Perrin 3inch intake with a AEM filter. Aftermarket BOV. Id1000 Injectors. IAG tgv deletes. Dw 400 pump. Iag fuel rails. Fuel pressure gauge. Cobb’s e-85 sensor. And the motor has forged rods and pistons. I understand the need to replace the Down pipe to one that is EPA compliant. Then also the Tgv”s reinstalled and hooked back up. But what about everything else? Can the rest stay on the car just not be utilized or do I need to get rid of mostly everything?

    • Eric_Brewed says:

      To use the Cobb without any CEL you would need to have OEM tgv’s, air pump, EGR and Gesi catted downpipe. Cobb will not longer support the flex fuel sensor kit/custom TGV inputs. Our Haltech package would allow you to keep the mods as they are now. STI haltech

  2. Cade Mollahan says:

    Could I still get a tune with an EWG setup?

    19 sti
    Cobb sf intake
    Turbo Inlet
    Aem 340
    Gesi v1 catted dp
    3 port
    Fuel stumble fix
    Fp blue

  3. Ron says:

    Currently have the secondary air pump delete, I am looking to go to either the FP Green or Bloush 2.5 XT-R, will the Cobb AP be able to be tuned with a check engine light or will it go into a limp mode?

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