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 We have found the M177

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

Power gains are calculated based on stock numbers measured by RENNtech

The center section of the diffuser also accepts the EU third brake light or may also be removed and a mesh grill insert installed for an even more customized look

RENNtech | X290 | AMG GT63 | Side Skirts | Carbon Fiber | Gloss Finish

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 We have found the M177RENNtech 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