If you're running E85 or ethanol mixes in your Audi, you need this kit! It's plug and play with a Bluetooth ethanol sensor. Easy 15 min install. Fast Shipping.
Ethanol (E85) is roughly $1 USD cheaper than 93 Oct, but contains about 110 octane. More Octane, less money, and allows you to run more boost safely. But.... you can't run straight (E-85), the car won't run well if at all. You have to mix it about E-30, without the sensor, it's hard to guess what % you actually have in your tank.