RENNtech ECU Upgrade for S 550 | W221 | 402 HP / 405 LB-FT | MY2007-2010 hsm RPM for Audi 4

RPM for Audi 4

Rear: Style: RTS Size: 20" x 12"  Weight:   Construction: 1-piece Forged Tire Size: 335/30/20

curbs and steep driveways

With increased engine performance it becomes necessary to further improve the drive line components

RENNtech ECU Upgrade for S 550 | W221 | 402 HP / 405 LB-FT | MY2007-2010 hsm RPM for Audi 4RENNtech 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