RENNtech ECU Upgrade 535i/ix LCI E60 (2006-2009 Manual & Steptronic N54B30) porsche-911--997-1---2004-2008--gt3-esr8805972 C257 - CLS 53 AMG

C257 - CLS 53 AMG

Gains: +63HP & +78TQ

The RENNtech Sport Muffler System for the W205 - C 63 AMG Sedan comes with an integrated valve system and utilizes the electronic OEM actuators

pulling the car to the ground for enhanced down force and stability at speed

Up to 413HP and 422  LB-FT

RENNtech ECU Upgrade 535i/ix LCI E60 (2006-2009 Manual & Steptronic N54B30) porsche-911--997-1---2004-2008--gt3-esr8805972 C257 - CLS 53 AMGRENNtech ECU Upgrade 535i ix LCI E60 (2006 2009 Manual & Steptronic N54B30). Up to 420 HP + 435TQ. Gains: +120 HP & +135 TQ. Our proprietary BMW 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,