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:

This acrylic coating is applied inside and out to ensure full coverage and protection

the factory settings do NOT allow the valves to fully open unless certain speed and/or RPM have been reached

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