R1 Performance Package for CLS 550 (C219- 422 HP / 421 LB-FT) mercedes-benz-sl-class--230---2003-2006--sl-500-esr8036938 With the proprietary RENNtech ECU+

With the proprietary RENNtech ECU+ Tuning the W463 - G550 (MY2019+) gains up to +102 HP and +128 LB-FT

RENNtech Stainless Steel Downpipes with 200 Cell Catalytic Converters for 216 - CL and 221 - S 63 AMG BiTurbo M157-Series

0 TDI [2 Filters Required] (HP: 240 | Year: 09 > 10)

The SLR McLaren Performance Exhaust consists of RENNtech Stainless Steel Sport Mufflers

R1 Performance Package for CLS 550 (C219- 422 HP / 421 LB-FT) mercedes-benz-sl-class--230---2003-2006--sl-500-esr8036938 With the proprietary RENNtech ECU+R1 Performance Package for 219 CLS 550. Includes ECU Upgrade and Stainless Steel Header. Up to 420HP and 421 LB FT. The R1 performance package for the Mercedes 550 includes our proprietary ECU upgrade in addition to our stainless steel shorty headers designed specifically for the 550 V8 for a combination that provides increased performance, sound and throttle response across the vehicles entire powerband. R1 performance package includes: RENNtech ECU