R1 Performance Package for CLS 63 (C219- 549 HP / 495 LB-FT) mercedes-benz-slk-class--170---1997-2003--slk-32-amg-esr3156573 ECU+ Upgrade | 601HP /

ECU+ Upgrade | 601HP / 657TQ | Gains: +56HP / +107TQ

Our freer flowing muffler weighs in at a scant 10 lbs per side in race configuration versus the factory mufflers which weigh in at a hefty 60 lbs per side

With the installation of the RENNtech Diverter Valve

CLASS S (W 221) 350 [2 Filters Required] (HP: 272 | Year: 06 > 11)

RENNtech ECU Upgrade for R171 - SLK 350

R1 Performance Package for CLS 63 (C219- 549 HP / 495 LB-FT) mercedes-benz-slk-class--170---1997-2003--slk-32-amg-esr3156573 ECU+ Upgrade | 601HP /R1 Performance Package for 219 CLS 63 AMG. Includes ECU Upgrade and Carbon Fiber Air Box. Up to 529HP and 495LB FT. Gains: +42HP & +30LB FT Our performance package includes our proprietary ECU tune in addition to our full carbon fiber airbox for a gain of +42 HP and +30 LB FT over stock. CLS 63 (W219) Stock Performance: 507 HP @ 6800 RPM; 465 LB FT @ 5200 RPM Modified Performance: 549 HP @ 6800 RPM; 495 LB FT @ 5200 RPM