RENNtech ECU+ Upgrade | R231 | SL 550 | 540HP / 705LB-FT | 4.7L V8 BiTurbo | M278 rpm Plug and Play with original

Plug and Play with original plugs

All RENNtech Track Series wheels are sold with a lifetime structural warranty so you can be confident that you are using a high-performance wheel with factory backing

RENNtech Stainless Steel Sport Mufflers for AMG SL 55 / SL 63 MY (R232) and AMG GT 55 & AMG GT 63 (C192)

200 cell sport catalytics for improved performance

High quality

RENNtech ECU+ Upgrade | R231 | SL 550 | 540HP / 705LB-FT | 4.7L V8 BiTurbo | M278 rpm Plug and Play with originalECU+ Upgrade 540HP 705LB FT Gains: +66HP +139LB FT RENNtech HHT (hand held tuner) allows you the unlimited ability to switch between tuned and stock ECU programming and requires no ECU removal! Our proprietary tuning module stores both the RENNtech tuned file and your vehicles stock file. The module plugs directly into the OBD2 port and delivers the file you choose directly to the ECU. Programming takes only a few minutes and the vehicle can be