RENNtech ECU Upgrade | C216 | CL 550 | 500HP / 625 LB-FT | 4.7L V8 BiTurbo | M278 | MY2011-2014 audi-rs7--c8---2019-present--4-0l-v8-tfsi-esr3673228 With the use of a

With the use of a receiver to drive the actuators that open or close the valves at the end of the exhaust system

3 Series COUPE' (E92) 335 Xdrive 3

911 - 997 3

Chose the optional link pipe for even better performance

RENNtech ECU Upgrade | C216 | CL 550 | 500HP / 625 LB-FT | 4.7L V8 BiTurbo | M278 | MY2011-2014 audi-rs7--c8---2019-present--4-0l-v8-tfsi-esr3673228 With the use of aECU Upgrade 500HP 625LB FT Gains: +52HP +87LB FT Our intermediate level ECU upgrade for the Mercedes M278 engine still offers huge gains in performance across the entire RPM range, but with a slightly reduced peak HP and torque from our standard tune. This is ideal for customers who want increased performance in their daily driver without worry of extra strain on driveline components or for areas and countries with extreme altitudes, temperatures or