RENNtech Porsche 997 GT2 ECU Upgrade (523 HP / 560 LB-FT) mercedes-benz-cls-class--219---2006-2011--cls-550-esr9083602 Combined with RENNTECH's ECU software

Combined with RENNTECH's ECU software our SL 63 down pipes create an incredible sound with performance to match

3 Series COUPE' (E92) 335 i 3

The tail pipes are the most visible part of the exhaust system

Our intermediate ECU tune increases performance from 429 HP and 516 lb/ft torque up to 500 HP and 625 lb/ft at the crank

Includes ECU Upgrade and Long Tube Header

RENNtech Porsche 997 GT2 ECU Upgrade (523 HP / 560 LB-FT) mercedes-benz-cls-class--219---2006-2011--cls-550-esr9083602 Combined with RENNTECH's ECU softwareRENNtech Porsche 997 GT2 ECU Upgrade. Up to 562HP and 575LB FT. Gains: +40HP & 74LB FT Our proprietary Porsche ECU upgrade offers rock solid performance from RENNtech, the foremost tuning authority on Bosch and Siemens engine control units. These same units are utilized in Mercedes Benz vehicles, which RENNtech has been tuning since electronic engine management started to show up in vehicles during the mid 1980's, though our proprietary tuning