One of the best Tuning House in Germany is ABT. Last week they showed their tuning kit for Audi RS4 Avant. This is most powerful and most aggresive kit for RS4, and it called RS4-R.
Standard RS4 Avant have 2.9 V6 Bi-Turbo TFSI Engine that produce 450 HP and accelerate from 0 to 100km/h in 4.1s. After ABT “surgery” New RS4-R have 540 HP and 690Nm. New RS4-R have a lot of new stuff like components of carbon fiber, sport exhaust system, alloy wheels of 21″, a modified suspension and inside trim.