E85 fuel unlocks the most performance potential from our ECU tunes for your Audi S6 or S7. Ethanol contains tons of oxygen, burns cooler, and has a high resistance to knock. This provides more horsepower and torque than running conventional gasoline and is more readily available (in most states) and less expensive than race gas. E85 is an optional fuel map included with all tune purchases.

The factory ECU calibration includes many compromises removed by your IE Tune. One of the most problematic is the stock cylinder deactivation which attempts to increase fuel economy by only running 4 cylinders when cruising. This causes rough shift, loss of power, and is believed to cause early failures of motor mounts. Cylinder deactivation is completely turned off by default. If you want to keep cylinder deactivation, we will reactivate on request.

Although full E85 is recommended for the highest power output, safeguards are included within the E85 ECU calibrations to adjust for ethanol as low as E65. This flexibility gives you the confidence to safely fill up at the pump which can commonly test lower than advertised.

Your Audi S6 or S7 has a powerful twin-turbo V8, it's time to sounds like one too! To help accomplish this, your IE Tune includes two optional features on all stages that will make your eight cylinder turbo sound like the king of the streets. Add the motorsport-inspired Exhaust Crackle to your exhaust note or the iconic lopey idle with Ghost Cam. These addicting features exist purely to add more fun and excitement to your drive and can be turned on or off at will with your IE POWERlink.

Exhaust Crackle & Ghost Cam features are available on stock hardware, but exhaust modifications are highly recommended for the loudest results.