GAS 70mm Throttle Body Upgrade, Audi 2.9T/3.0T EA839The world's first throttle body upgrade kit for the EA839 2. 9T 3. 0T is here! The stock B9 S4 S5 RS4 RS5 SQ5 2. 9T 3. 0T engine uses a small, economically designed 58mm 2. 28" throttle body with plastic flanges, a design that leaves a lot of room for improvement, especially on cars with upgraded tuning or larger turbochargers. The sandwiched design also invites boost leaks from both sides of the throttle body. Rather than offering a band aid in the