Performance Stage 1+ ECU Software Precisely Engineered for your D3 A8 with the 4.2L V8 engine.  This vehicle has added support through UniCONNECT+ which allows you to program your own vehicle right in your own garage. Unitronic software is flashed directly through the (OBDII) diagnostic port of your vehicle (10-15 minutes). Features: Gains over stock: +24HP / +17TQ (93 Octane Fuel) Engineered with Strict Industry Standards Extensively Tested Under Various Driving Conditions Factory Safety Limiters Retained Optimized Responsiveness and Drivability Optimized Smoothness and Driving Comfort Power Delivery Perfectly Optimized Throughout the Power Band Improved Fuel Efficiency Speed Governor Removed Lower End Hesitation (Lag) Removed Ignition Timing Precisely Calibrated for Higher Octane Fuel Includes all Stage 1+ tune variants and all lower software stages as well Hardware Requirements: None What's Included: Unitronic Stage 1+ ECU Tune Unitronic UniCONNECT+ Cable (OPTIONAL)