This is priceless and goes to show you have 0 knowledge in the tuning world. The link you put is for a flex fuel sensor. As I said the Stinger is a sensor. Now here is the kit, which includes fuel lines, injectors, fuel rails, and oh look a tuner which involved re writing the maps.
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COBB Flex Fuel Kit w/ Stage 3 Power Package Black 2019-2021 STI / 2018 STI Type RA
Buy COBB Flex Fuel Kit w/ Stage 3 Power Package Black 2019-2021 STI / 2018 STI Type RA, a Flex Fuel by COBB Tuning, for only $6,245.00 at Subimods.com!subimods.com
You do realize you quoted a Stage 3 kit, right? That’s not what we’re talking about here. You’re moving the goal posts yet again. Once again we’re talking E30, not E85. Your big power stage 3 kit is for E85.
Pay attention to what’s stated on the page and you’ll notice how wrong you continue to be.
FROM COBB’s website
“Fuel System Considerations
As with other DIT platforms i.e. VW, BMW, Mazda, the fuel pumps in Subaru DIT vehicles are not designed for ethanol use beyond 10-15%. That said, ethanol levels between 15-30% are generally well tolerated. Those comfortable with mild risk can run ~E30 and enjoy improved knock resistance, charge air cooling, and a mild improvement in engine power potential. While you can't get E30 at the pump, pumping a combination of E0/E10 gas and E85 in an appropriate ratio will allow blending of a near E30 mixture in your tank.”
Yes, you need a tune to take advantage of the E30. And some piggybacks for the Stinger do adjust the fueling for flex fuel by taking the signal, relaying it to the piggyback to then adjust fueling in near real time. Cobb nor the link you provided are saying you need to replace the full on fuel system for MILD improvement.
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