2021 Subaru WRX Support


Subaru’s 2021 WRX 6MT is now fully supported within the COBB product line.  We have confirmed fitment of our bolt-on upgrades such as the Big SF Intake System, Top Mount Intercooler (both black and silver), and Air/Oil Separator.  The SUB-004 Accessport comes loaded with Off The Shelf Maps to support all of our common bolt-on upgrades.  For those interested in taking their 2021 WRX beyond the scope of our Stage Power Packages and Off The Shelf Maps, Subaru Accesstuner and Accesstuner Pro both now offer full tuning support, including COBB Custom Features.

For a complete list of compatible parts, visit the 2021 Subaru WRX MT USDM Vehicle Page on the COBB Tuning website!  Have a different model year? See our expansive list of WRX aftermarket parts.

Subaru Accessport V3 (AP3-SUB-004)

accessport_v3_subaru The Accessport is the world’s best selling, most flexible, and easiest to use ECU upgrade solution for your Subaru. Unlock power hidden within the vehicle by replacing conservative factory settings with more aggressive calibrations. Follow our staged upgrade path with pre-loaded Off The Shelf (OTS) maps or use custom mapping for any modification level. It’s the last engine management solution you’ll ever need.

Subaru Accessport V3 (AP3-SUB-004)

Off The Shelf Maps

Off The Shelf Maps for the 2021 WRX 6MT utilize our CCFv2 ECU type, taking advantage of features such as MAF Simple and Closed-Loop fueling to deliver higher, more consistent power.

Each Accessport comes pre-loaded with an assortment of Off The Shelf Maps that support from a completely stock car up to a car with a full turboback exhaust and COBB Big SF Intake System.  Map files are available for cars using either 91 or 93 octane fuel.  Stage 1 and Stage 1+BigSF map produces peak gains of +14% HP / +13% TQ over stock and maximum gains of +98% HP / +98%TQ over stock when using 93 octane fuel. Stage 2 and Stage2+BigSF produce peak gains of +19%HP / +40% TQ over stock and maximum gains of +110% HP / +110% TQ over stock when using 93 octane fuel.  Due to the significant power drop observed at redline on the stock calibration, percent gains are drastically different than previously published.  With OTS Maps carrying power out all of the way to redline, the differential at 6800 RPM is over 100% for both horsepower and torque.  As you can see in the graphs below, this is obviously an extreme condition.  We are still seeing significant gains across the entire RPM range and.  Cars utilizing a Stage1+BigSF or Stage2+BigSF map with the COBB Big SF Intake System can expect to see 10-12 HP in addition to the presented non-SF dyno charts.

*For a complete explanation of each Off The Shelf Map for the 2021 WRX, visit our Map Notes Page.




The following map files are available for the 2021 WRX 6MT either via a firmware update through Accessport Manager or via download on the COBB website.  Stage 2 and Stage2+BigSF OTS Maps must be downloaded from the COBB website.

  • Stage0 v400.ptm
  • Stage1 91 v400 HWG.ptm
  • Stage1 91 v400 LWG.ptm
  • Stage1 91 v400.ptm
  • Stage1 93 v400 HWG.ptm
  • Stage1 93 v400 LWG.ptm
  • Stage1 93 v400.ptm
  • Stage1 Economy Mode v400.ptm
  • Stage1 Valet Mode v400.ptm
  • Stage1+BigSF 91 v400 HWG.ptm
  • Stage1+BigSF 91 v400 LWG.ptm
  • Stage1+BigSF 91 v400.ptm
  • Stage1+BigSF 93 v400 HWG.ptm
  • Stage1+BigSF 93 v400 LWG.ptm
  • Stage1+BigSF 93 v400.ptm
  • Stage1+BigSF Economy Mode v400.ptm
  • Stage1+BigSF Valet Mode v400.ptm
  • Stage2 91 v400 HWG.ptm
  • Stage2 91 v400.ptm
  • Stage2 93 v400 HWG.ptm
  • Stage2 93 v400.ptm
  • Stage2 Economy Mode v400.ptm
  • Stage2 Valet Mode v400.ptm
  • Stage2+BigSF 91 v400 HWG.ptm
  • Stage2+BigSF 91 v400.ptm
  • Stage2+BigSF 93 v400 HWG.ptm
  • Stage2+BigSF 93 v400.ptm
  • Stage2+BigSF Economy Mode v400.ptm
  • Stage2+BigSF Valet Mode v400.ptm
  • Vehicle Anti-Theft Mode v400.ptm

2021 Subaru WRX Stage Power Packages

COBB Stage Power Packages take the guesswork out of upgrading your 2021 WRX.  We have combined our precision engineered bolt-on parts with the Accessport and professionally calibrated Off The Shelf Maps to create a completely turn-key package.  Keep it mild with a Stage 1+Big SF Package or maximize airflow with the COBB Stage 2+Big SF Package!

SUB0040W1P_main 641XR2_main SUB004NW2P_main

*Visit the 2021 WRX MT USDM Vehicle Page for a complete list of compatible products.

But Wait, There’s More!

Interested in more than just go-fast parts for your 2021 WRX?  We have you covered!  For a complete list of modifications available for your WRX, visit the 2021 WRX Vehicle Page or click on any of the products below for more information.  Wondering which Subaru models we support? Check out our entire selection of Subaru aftermarket parts.

815070_main 515140_main B42400-BK_main-2
SUB0DT0110_main-2 842650_main 843615_extra_01
COBBWT444391-444392_main 862001_main 324600_main
8W4650S_extra_01 8W4625_extra_01-2 8W4600S_extra_01

Miscellaneous Accessport Firmware Updates

In addition to new vehicle support, Subaru Accessport firmware also received some miscellaneous updates to improve Protuner workflow and streamline customer experience.

  1. Added 2021 ADM WRX STI Support
    1. Carry-over of 2020 ADM WRX STI
  2. New Monitors for 2015-2021 WRX CCF Gen2 ECU Types
    1. CPC Purge Flow
    2. CPC Purge Fuel Learn\
  3. Monitor Updates
    1. “Boost Limits FINAL Rel Sea Level” renamed to “Boost Limits Base FINAL Release Sea Level”
    2. AF Correction 3 monitor sign (+/-)  inverted to match display of other fuel trims (EJ ECUs only)

Subaru Accesstuner Pro HL Updates

  1. Full Tuning Support for 2021 WRX 6MT via CCF Gen2 ECU Type
  2. Full Tuning Support for 2021 ADM WRX STI
  3. New Monitors
    1. CPC Purge Flow
    2. CPC Purge Fuel Learning
  4. Monitor Updates
    1. “Boost Limits FINAL Rel Sea Level” renamed to “Boost Limits Base FINAL Release Sea Level”
    2. AF Correction 3 monitor sign (+/-)  inverted to match display of other fuel trims (EJ ECUs only)

4 responses to “2021 Subaru WRX Support”

  1. How do i upload more maps onto my accessport and where or does it have a section like for example hondata s300v3 where you can adjust your fuel table and ignition table and turn off different sensors etc.

    • Hi Koa,

      In order to add/remove maps from the Accessport as well as apply new firmware or transfer datalogs, you can use this free program: Accessport Manager

      In order to make adjustments to a tune regarding ignition or fuel etc. We offer an online training course via EFI Univ that is linked through the Accesstuner product pages on our website. If you complete the course, then you will receive a copy of a user version of the software in order to customize maps specifically for your Accessport and car.

      [email protected]

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