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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:
CL 600 (C215 – M137 5.8L V12 Engine) Modified Performance:
Our online store allows you to choose the best performance parts for your car. Instead of having the items delivered to your home, we can deliver direct to your local service center. You can browse products on this website. Please feel free to place an order and one of our representatives will contact you to arrange delivery and installation if requested of your new performance parts.