RENNtech HHT ECU Upgrade | CL 600 | C215 | 417HP/453LB-FT | 5.8L V12 | M137 | MY2000-2002 porsche-911--992---2018-present--targa-4s-esr1392676 Rated by Mercedes-Benz: 556 HP

Rated by Mercedes-Benz:      556 HP @ 5

523 hp @ 4

Most of the industry utilizes a lower cost

RENNtech proudly introduces this addition to an already impressive and highly successful aerodynamic upgrade program for the Mercedes-Benz SLS AMG

The maximum power number reached with the RENNtech ECU Upgrade for the GT 63 AMG S 4-Door Coupe is 783 HP and 798 LB-FT

RENNtech HHT ECU Upgrade | CL 600 | C215 | 417HP/453LB-FT | 5.8L V12 | M137 | MY2000-2002 porsche-911--992---2018-present--targa-4s-esr1392676 Rated by Mercedes-Benz: 556 HPRENNtech 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