RENNtech HHT ECU Upgrade | CL 600 | C215 | 417HP/453LB-FT | 5.8L V12 | M137 | MY2000-2002 mercedes-benz-s-class--222---2018-2020--s-650-maybach-esr9170956 Constructed of high strength

Constructed of high strength

RENNtech ECU Upgrade for 231 - SL 65 AMG

while cruising the exhaust valves will never fully open

CLASS E (W 210) 320 V6 (HP: 224 | Year: 97 > 99)

Easy Grip Base Taller base ensures a better grip

RENNtech HHT ECU Upgrade | CL 600 | C215 | 417HP/453LB-FT | 5.8L V12 | M137 | MY2000-2002 mercedes-benz-s-class--222---2018-2020--s-650-maybach-esr9170956 Constructed of high strengthRENNtech 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