R2 Performance Package | R230 | SL 55K | 588 HP / 616 LB-FT | 5.5L Supercharged V8 | M113R2 Performance Package for 230 SL 55 AMG Kompressor. Includes ECU Upgrade and Crankshaft Pulley. Up to 588HP and 616LB FT. Gains: +95HP & +98LB FT Performance package R2 takes performance to the next level and is a step up from our R1 tuning package. The R2 performance package includes the same components found in our R1 package with the addition of a full carbon fiber airbox, RENNtech stainless steel exhaust headers, 82 mm throttle body upgrade and