Ethanol is rocket fuel for your 2022+ VW GTI, Golf R, or Audi S3. Take the guesswork out of E85 with iE TrueFlex Engine Tuning and Ethanol Harness Kit. This complete plug-and-play harness is everything required to utilize iE VW MK8/Audi 8Y TrueFlex tuning features. Simply install this factory-fit harness, update your iE Tune, and enjoy easy and safe ethanol.

Meet the Ethalyzer, the key to unlocking flex-fuel in your VW MK8 or Audi S3 engine. This in-house-designed innovation is at the center of our flex-fuel harness kit and is responsible for eliminating the guesswork with TrueFlex Tuning. By converting raw ethanol sensor signals into clean, MK8 ECU-ready CAN data, the Ethalyzer provides your engine management system with instant, real-time fuel content information. That means instant and seamless adjustments to ignition, fueling, and boost, regardless of the fuel content in your tank. Enjoy maximum performance, safety, and reliability on pump gas, E85, or anything in between.

This harness kit is fully assembled to the proper lengths. It includes everything needed for a clean, factory-like installation. You’ll want to utilize the expertise of a pro for disconnecting and cutting the factory soft fuel lines.

AVERAGE INSTALL TIME: AROUND 3 HOURS