R1 Performance Package | R171 | SLK 55 AMG | 385 HP / 400 LB-FT | 5.5L NA V8 | M113 mercedes-benz-e-class-sedan--210---1996-2002--e-320-esr2744801 RENNtech Stainless Steel Downpipes with

RENNtech Stainless Steel Downpipes with 200 Cell Sport Catalytic Converters for 222 - S 63 AMG Sedan and 217 - S 63 AMG Coupe Model Years 2018+

development and exhaustive testing ensure that our proprietary ECU upgrade offers incredible performance gains and rock solid daily driver reliability

0L V12 BiTurbo) Modified Performance (at crank):

Fit and finish meets OEM Mercedes-Benz quality standards thanks to the parts 100% pre-preg carbon fiber construction

681 HP   736 LB-FT   W222 - AMG S63 ECU Upgrade

R1 Performance Package | R171 | SLK 55 AMG | 385 HP / 400 LB-FT | 5.5L NA V8 | M113 mercedes-benz-e-class-sedan--210---1996-2002--e-320-esr2744801 RENNtech Stainless Steel Downpipes withR1 Performance Package for 171 SLK 55 AMG. Includes ECU Upgrade and Carbon Fiber Air Box. Up to 385HP and 400 LB FT. Gains: +30HP & +24LB FT The R1 performance package for the Mercedes 55 series engine includes our proprietary ECU upgrade in addition to our full carbon fiber airbox upgrade which offers a larger volume of incoming air for better engine breathing and improved cylinder filling. This combination that provides noticeable increases