RENNtech HHT ECU Upgrade | CL 600 | C215 | 417HP/453LB-FT | 5.8L V12 | M137 | MY2000-2002 mercedes-benz-cls-class--219---2006-2011--cls-55-amg-kompressor-esr8681054 Not just a pretty to

Not just a pretty to look at

400rpm range for TQ

Give your AMG GT R an aggressive makeover with these RENNtech front canards as part of our Clubsport Package

540 wtq @ 4

We have found the M177 engine stock performance numbers vary from the baseline figures claimed by Mercedes Benz

RENNtech HHT ECU Upgrade | CL 600 | C215 | 417HP/453LB-FT | 5.8L V12 | M137 | MY2000-2002 mercedes-benz-cls-class--219---2006-2011--cls-55-amg-kompressor-esr8681054 Not just a pretty toRENNtech HHT ECU Upgrade for the 215 CL 600. Up to 417HP and 446TQ. Gains: +55HP & +56TQ RENNtech M137 V12 ECU Upgrades are TV 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