Supported Vehicles:

STI USDM 2019-2021
STI Type RA 2018
STI ADM STI 2019
North American 2019 STI S209

*To confirm your model year, you can refer to the tenth value in the VIN number on the vehicle. For model year 2001-2009, the 10th value in the VIN will be the last digit of the model year. For model year 2010-2019, the 10th value in the VIN will be A-K, starting with 2010, ending with 2019.

Current Map Revision:

North American 2018 STI Type RA, 2019-2021 STI	North American 2019 STI S209	ADM 2018-2019 STI

North American 2018 STI Type RA, 2019-2021 STI	North American 2019 STI S209	ADM 2018-2019 STI
Stage1 v521 Boost Select Stage1+SF v521 Boost Select NexGen Stage2 1050x v521 NexGen Stage2 1050x + Flex Fuel v510	Stage1 v521 Boost Select	Stage1 v346 Boost Select Stage1+SF v346 Boost Select Stage2 v346 Boost Select

Accessport Firmware:

AP3-SUB-004: 1.7.4.0-17431 or greater
AP3-AU-SUB-004: 1.7.4.0-17431 or greater

Fuel Requirements:Each map lists the minimum required octane. A higher octane fuel can be used safely on a map designed for lower octane. DO NOT use maps designed for higher octane with lower octane fuels. Top Tier gasoline should be used where available.

Maps designated with "93" are for use with 93 and 94 octane/98 RON fuel or better.
Maps designated with "91" are for use with 91 and 92 octane/95 RON fuel or better.
Maps designated with "ACN91" are for use with 91 octane fuel found in Arizona, California, and Nevada or better. And additionally for those in Canada, for use with 94 octane Fuel at a minimum.
Maps designated with an octane (ACN91, 91, 93) and FlexFuel are good for the labelled fuel octane, E85 and any blend in-between.

2018 WRX STI Type RA (North American spec)
2019-2021 WRX STI (North American spec)

Flex Fuel Gains

Hard Part Requirements for Maps

HWG: Higher wastegate duty cycles (HWG) for use when normal wastegate calibration produces lower than targeted boost (i.e. under boost).
LWG: Lower wastegate duty cycles (LWG) for use when normal wastegate calibration produces higher than targeted boost (i.e. over boost).

2019 STI S209 Stage 1

Stage 1

Intake Requirements: Stock airbox with stock air filter
Exhaust Requirements: Stock exhaust or upgraded cat-back exhaust
Boost Targets:
- 93 octane (98 RON) Minimum: ~22psi [S#] tapering down as you approach the 7000RPM redline, +/- 1.5psi.

The COBB OTS Map availability for the S209 is a bit different than our typical WRX or STI assortment. With a limited number of cars available to be used for testing, and based on our findings, the only performance map offered at this time is a Stage 1 OTS map for 93 octane fuel. During investigation and development of this map, our calibration team noted that even utilizing the factory calibration with 93 octane fuel, the S209 exhibited an inconsistent and undesirable amount of knock.

For more information on the s209 release check out our blog post https://www.cobbtuning.com/2019-subaru-wrx-sti-s209-tuning-support

Non-Performance Maps

Anti-Theft Mode

Map Notes for 2019 - 2021 STI, 2018 STI Type RA, S209