RENNtech M157 Biturbo ECU Upgrades are TÜV approved!

Our proprietary ECU upgrade for the Mercedes M157 engine offers huge gains in performance across the entire RPM range without sacrificing around town comfort or daily driver reliability.

Our ECU tune offers the biggest performance gains on the market; increasing performance from 550 HP and 560 lb/ft torque, to an astonishing 669 HP and 738 lb/ft at the crank!

GL 63 (X166) Stock Performance:

• 550 HP @ 5250 RPM; 560 LB-FT @ 2000 RPM

• Note: We have found the new M157 engine stock performance numbers vary from the baseline figures claimed by Mercedes Benz. We typically see slightly higher baseline numbers than claimed by the factory.

Modified Performance:

• 669 HP @ 5500 RPM; 738 LB-FT @ 3800 RPM