JB4 Tuner for 2013-2018 4.0T Audi S6, S7, S8, RS6, RS7, A8 - Burger TuningPower gains of up to 60hp and 75tq to the wheels on a stock vehicle! The JB4 is an easy to install plug and play tuner that attaches to sensors in the engine bay and works with your factory ECU tuning to remap boost, timing, and fueling for optimal performance and reduced turbo lag. Includes full CANbus allowing the JB4 to access and incorporate all engine data in its tuning strategies, incorporate unique safety features such as keeping boost pressure