RENNtech Intermediate ECU Upgrade | R231 | SL 63 AMG | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2015+ mercedes-benz-cla-class--118---2020-present--cla-250-esr6895269 Our pre-preg production process ensures

Our pre-preg production process ensures our customers receive an exceptional product which not only looks good on the vehicle while standing still

California

S8 (D4/4H)

623 LB-FT @2

Lamborghini Urus

RENNtech Intermediate ECU Upgrade | R231 | SL 63 AMG | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2015+ mercedes-benz-cla-class--118---2020-present--cla-250-esr6895269 Our pre-preg production process ensuresIntermediate ECU Upgrade Up to 638HP 695TQ Gains: +33HP +25TQ 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