RENNtech R2 Pkg | C218 | CLS 63 AMG | 716 HP / 826 LB-FT | M157 | 5.5L V8 BiTurboR2 includes: ECU Upgrade, Diverter Valve, Air Filters, Sport Mufflers and CF Airbox Gains: +111HP; +180LB FT The RENNtech R2 Performance Package is the evolution stage of the R1 Pkg. The R2 not only brings additional power, but also gives the car a deeper sport sound that keeps with character of a luxury performance vehicle. Included in the R2 Package are all upgrades from the R1 Pkg, ECU Upgrade, Diverter Valve and Air Filters, as well as the Carbon