True Flex FuelWe are excited to release our Flex Fuel tunes for Stage 3 (IS38) customers with EA888.3 MK7 and 7.5 GTI, as well as Audi A3, and TT. This Beta release is available for SIMOS 18.1 and SIMOS 18.10 ECU (most 2015-2021 models)If you are looking to maximize your performance on every drop of Ethanol, our Flex Fuel tune is ready for you. Customers looking to participate in the Beta release are required to be running the following upgrades: Required hardware upgradesDownpipe upgradeRequiredIntercooler upgradeRequiredIS38 turbo upgradeRequiredMPI (Multi Port Injection)Required (Files ready for 980cc injectors)Flex Fuel SensorRequiredLow Pressure Fuel Pump upgradeRequired (Hellcat 525/535 or similar) To apply for this Beta and receive some of the TZ family perks, click here!