RENNtech ECU Upgrade | GL 550 | X166 | 480HP / 605LB-FT | 4.7L BiTurbo | M278 Engine audi-s3--8p---2006-2012--2-0l-tfsi-esr5566206 The customized crossbar is made

The customized crossbar is made out of high-performance carbon fiber to minimize flexing between the vehicles strut towers

The RENNtech performance turbo upgrade is truly the ultimate upgrade for your E63 (S) AMG Sedan and Wagon

R3 Performance Package for Mercedes-AMG G 63: ECU Upgrade (HHT)

RENNtech Sport Mufflers are made out of T-304 stainless steel (SS) and 100% hand crafted in the USA

RENNtech ECU Upgrade | GL 550 | X166 | 480HP / 605LB-FT | 4.7L BiTurbo | M278 Engine audi-s3--8p---2006-2012--2-0l-tfsi-esr5566206 The customized crossbar is madeECU Upgrade 480HP 605LB FT Gains: +32HP +67LB 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