RENNtech ECU Upgrade for S 550 | W221 | 402 HP / 405 LB-FT | MY2007-2010 audi-rs4--8k---2012-2015--4-2l-v8-fsi-esr2470407 CLASS GL (X 164) 450

CLASS GL (X 164) 450 [2 Filters Required] (HP: 340 | Year: 06 >)

RENNtech inner fender housings are required

646 LB-FT @2

They have also been maximised in internal volume to reduce restrictions and in doing so we have also redesigned the OEM central cover as it fouls on the significantly larger system

RENNtech Bluetooth HSM | Digital Suspension Lowering Module for vehicles equipped with Airmatic / Magic Body Control Suspension

RENNtech ECU Upgrade for S 550 | W221 | 402 HP / 405 LB-FT | MY2007-2010 audi-rs4--8k---2012-2015--4-2l-v8-fsi-esr2470407 CLASS GL (X 164) 450RENNtech ECU Upgrade for 221 S 550. Up to 402HP and 405 LB FT. Gains: +20HP & 14 LB 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