Mercedes SL 231 – SL 550 BiTurbo
RENNtech ECU+ Upgrade | R231 | SL 550 | 540HP / 705TQ | 4.7L V8 BiTurbo | M278
ECU+ Upgrade | 540HP / 705LB-FT | Gains: +92HP / +167LB-FT
RENNtech ECU Upgrade | R231 | SL 550 | 500HP / 625TQ | 4.7L V8 BiTurbo | M278
ECU Upgrade | 500HP / 625LB-FT | Gains: +52HP / +87LB-FT
RENNtech Stainless Steel Muffler for 231 – SL 550
RENNtech Stainless Steeel Sport Muffler for 231 – SL 550. Gaines: +15HP & 20TQ
Mercedes 722.9 Seven Speed Transmission Upgrade
RENNtech Transmission Upgrade for 722.9 Mercedes Seven Speed Transmissions.
