RENNtech ECU Upgrade M137

RENNtech M137 V12 ECU Upgrades are TÜV approved!

Our proprietary ECU upgrade for the Mercedes M137 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 with our dyno results increasing performance from 362 HP and 390 lb/ft torque, up to an astonishing 427 HP and 453 lb/ft at the crank!

CL 600 (C215 - M137 5.8L V12 Engine) Stock Performance:

• 362 hp @ 4,900-5,500 RPM; 390 lb-ft @ 1,900-4,000 RPM

• Note: Mercedes M137 engine performance when measured obtains higher numbers that rated from factory.

CL 600 (C215 - M137 5.8L V12 Engine) Modified Performance:

• 417 hp @ 5,100 RPM; 446 lb-ft @ 4,000 RPM