TrueFlex is our innovative Ethanol Flex Fuel solution for the Audi RS5 & RS4 2.9TT. Running ethanol unlocks massive power gains over premium gasoline. No switching tunes, just fill and go!

Installing TrueFlex on your 2.9TT is incredibly easy. Purchase and install the iE TrueFlex Sensor Kit and update the engine control computer with your PowerLink app. Fill up with either premium unleaded or E85 and enjoy maximum performance. You can monitor your ethanol content right on the app.

Ethanol is an alcohol fuel with very high octane. It burns cooler than gasoline, and protects engine components by fiercely resisting knock. The trade-off of Ethanol is that gas mileage will decrease by up to 35%. Per-gallon savings at the pump offset the increased consumption. Modern Audi’s have no corosion issues with Ethanol fuels.

• Stage 1 & 2 peak power mix: 40-50% ethanol
• Stage 1+ & Stage 2+ (HPFP) peak power mix: E60-80% ethanol
• Requires iE POWERlink Tuning Suite
• Requires iE TrueFlex Sensor Harness Kit
• Requires iE HPFP Upgrade (fuel pump)