RS5 is certainly a good car, but it's impossible to talk about without comparing it to the M3, and the Audi tends to fall a bit short. Despite the RS title, it lacks the hardcore edge of its chief rival. Senner Tuning
has corrected this problem and then some with their RS5. Senner has squeezed 500 horsepower out of the Audi's 4.2-liter V8 FSI through the use of a new exhaust system and tweaks to the engine software.