RENNtech ECU Upgrade GL 450 (X166- 501 HP / 576 LB-FT for M278 Biturbo) mercedes-benz-glc-class--253---2016-present--glc-43-amg-esr6444157 R1 Performance Package for 230

R1 Performance Package for 230 - SL 600

SL 63 (R230) Stock Performance:

RENNtech is proud to introduce an all new rear decklid spoiler design for the Mercedes-Benz C-Class Coupe

The maximum power number reached with the RENNtech ECU+ Upgrade for the W463 - G 550 4x4² is up to 523 HP and 583 LB-FT

RS7 (C8 4K)

RENNtech ECU Upgrade GL 450 (X166- 501 HP / 576 LB-FT for M278 Biturbo) mercedes-benz-glc-class--253---2016-present--glc-43-amg-esr6444157 R1 Performance Package for 230RENNtech ECU Upgrade for 166 GL 450 BiTurbo. Up to 501HP and 576LB FT. Gains: +139HP & +170LB 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