Cobb Flex Fuel WRX and STI NexGen Update

The NEW NexGen Flex Fuel kit STI platform from Cobb is officially here! We are stocking all the the NexGen Flex Fuel kits as well as offering Pro-tune aka E-tune support for all 2008-2021 STI and 2015+ WRX using the Cobb NexGen Flex Fuel packages or Cobb CAN Flex Fuel WRX.

Cobb wrx flex fuel
WRX Flex fuel

If you have been looking for a way to make more power with your WRX or STI and have e85 or flex fuel at your local gas station this is the update you’ve been waiting for.

Your engine will make 15-30% more power simply by switching to e85 or flex fuel compared to 91 octane pump gas. The higher octane rating for ethanol and E85 allows the engine to run more boost and more timing with increased reliability. This means more power and big smiles, there really isn’t anything like a turbo engine running on an Ethanol based fuel!

Those with built engines or upgraded turbos often use E85 and flex fuel to support 500+ HP which makes for one fast and fun STI 

IAG stage 2 EJ25

Flex Fuel Benefits:

  • Higher octane fuel provides a larger safety margin for the engine  
  • Make more power than 91 or 93 octane fuel (10-30% gains depending on ethanol level)
  • Flex Fuel kits allow you to blend gasoline and E85/flex fuel as needed or as available. 
  • ***NO need to change maps when changing between gasoline and E85
  • Lower EGT’s (Ethanol fuel will provide lower exhaust gas temperatures compared to gasoline)
  • Smells GREAT, E85 burning has a much cleaner/softer smell when compared to gasoline
  • Green, ethanol is a renewable fuel source that can be made from any sugar/starch. 
cobb nexgen flex fuel

The plug and play NexGen Flex Sensor for the 08-21 STI is the heart of our NexGen Flex Fuel kit. The flex fuel kit consists of an ethanol content sensor with mounting bracket, fuel lines, a NexGen Flex Fuel module, and a plug-n-play wiring harness. For the 2015-21 WRX Cobb has upgraded to the CAN Flex Fuel kit. This new Flex Fuel package utilized the Cobb CAN gateway module. Simply put this CAN gateway allows us to add flex fuel, fuel pressure and any other 0-5v signal you may want to data log through the stock ECU with the COBB AP.

The OE quality ethanol content sensor is secured to a bespoke powder coated aluminum mounting bracket. The sensor is supplied with fuel through pre-made fuel lines with OE quick disconnect. A billet adapter is included to allow for seamless integration using the COBB Fuel Rail Line Kit.

Tying everything together is a custom, easy to install, plug-and-play wiring harness. Utilizing OE quality wiring and connectors ensures installing the NexGen Flex Fuel kit on your STI or WRX is smooth, easy and reliable for the life time of your vehicle.

Flex Fuel Tuning STI and WRX

If you have any questions or requests about the NexGen Cobb Flex Fuel packages and tuning don’t hesitate to give us a call or send us an email.

There is a lot of misleading information out there regarding Flex Fuel and we are here to provide transparent explanations for all the parts and functions. We are here to support you and your build with whatever your heart desires! 

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