German tuner dials output up to 506 PS (372 kW / 499 bhp) and 478 Nm (353 lb-ft) from the series 450 PS (331 kW / 444 bhp). Senner also adds a Bilstein suspension kit and 20-inch wheels.
(http://imgs.blackfalconmedia.com/2010/12/17/medium/6792570401395670231.jpg)
500 horsepower Audi RS5 by Senner Tuning (http://feeds.worldcarfans.com/~r/worldcarfans/Jxfz/~3/2KMEXzvlKIA/500-horsepower-audi-rs5-by-senner-tuning)