RENNtech HHT ECU Upgrade | CL 600 | C215 | 417HP/453LB-FT | 5.8L V12 | M137 | MY2000-2002 mercedes-benz-cl-class--215---2001-2006--cl-600-biturbo--2003-2006--esr3211224 See STAGE 1 and STAGE

See STAGE 1  and STAGE 2 Turbo Upgrade for additional details

Power figures are calculated with a 16% drivetrain loss for AWD 9-speed vehicles

and tested using state-of-the-art programs and analysis tools for achieveing an OEM level of quality and fitment at the RENNtech headquarters in Stuart

Prepreg is widely known as the finest process in carbon fiber manufacturing and has been used for aerospace and military applications because of its superior consistency in weight

380 HP @ 5500 RPM

RENNtech HHT ECU Upgrade | CL 600 | C215 | 417HP/453LB-FT | 5.8L V12 | M137 | MY2000-2002 mercedes-benz-cl-class--215---2001-2006--cl-600-biturbo--2003-2006--esr3211224 See STAGE 1 and STAGERENNtech 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