RENNtech ECU HHT Upgrade for GL 550 X164 | 402 HP / 405 LB-FT audi-rs4--b7---2006-2008--4-2-v8-fsi-esr4648829 Our down pipes mate perfectly

Our down pipes mate perfectly with the stock Mercedes-Benz AMG exhaust system and include all necessary mounting hardware and clamps

Fuel System Upgrade

RENNtech throttle body assemblies were designed and engineered in house and a re a bolt on component requiring no modifications to the intake manifold

No re-programming of ECU needed

Rated by RENNtech:               500 HP @ 5

RENNtech ECU HHT Upgrade for GL 550 X164 | 402 HP / 405 LB-FT audi-rs4--b7---2006-2008--4-2-v8-fsi-esr4648829 Our down pipes mate perfectlyRENNtech ECU HHT Upgrade for 164 GL 550. Up to 402HP, 405LB FT. Gains: +20HP & 14LB FT RENNtech has been at the forefront of ECU tuning since electronic engine management started to show up in vehicles during the mid 1980's! Our experience, countless hours of in house research, development and exhaustive testing ensure that our proprietary ECU upgrade offers incredible performance gains and rock solid daily driver reliability. RENNtech tuning software