R2 Performance Package for CLK 63 Black Series (C209- 571 HP / 533 LB-FT) bmw-x3--e83---2003-2010--esr8995031 GL 450 (X166- M278 Biturbo

GL 450 (X166- M278 Biturbo Engine) Stock Performance:

Huracan STO

We have found the M176 engine stock performance numbers vary from the baseline figures claimed by Mercedes-Benz

These gaskets are crucial for maintaining engine performance and preventing potential damage from leaks

Our proprietary Bentley ECU upgrade offers rock solid performance from RENNtech

R2 Performance Package for CLK 63 Black Series (C209- 571 HP / 533 LB-FT) bmw-x3--e83---2003-2010--esr8995031 GL 450 (X166- M278 BiturboR2 Performance Package for 209 CLK 63 AMG Black Series. Includes ECU Upgrade and Carbon Fibre Air Box. Up to 571HP and 533LB FT. RENNtech performance package 2 includes our proprietary ECU tune in addition to our full carbon fiber airbox, 82mm throttle body kit and RENNtech stainless steel headers for a gain of +53 HP and +68 LB FT over stock. Performance Package 2 Includes: RENNtech ECU Upgrade Full Carbon Fiber Airbox 82mm Throttle Body Kit