The 4.0L TFSI engine is a potent and capable powerplant in addition to being paired to the famous AWD systems Audi/Porsche are known for. Through rigorous testing on both the street and dyno, the Weistec 4.0 TFSI ECU Upgrade for the 4.0 Liter Twin Turbo V8 engines reliably extracts massive gains in the mid range of the powerband as well as substantial gains in the top end making it a top performer in all driving situations.

Toggle between W.1 and W.2 above to see various levels of power gains achievable with our tuning.

KEY FEATURES:

• Increased Boost
• Optimized Fueling/li>
• Optimized Ignition Timing
• Removed Speed Limiter
• Optional Burble
• Optional E85 Tune (Stock Turbos Only)
• Optional Cypher Handheld

*Power gains vary based on model, modifications, fuel, and running conditions.