I would recommend it, gave me 22hp, did´nt feel that much off a difference (never does on a n/a) but the fuel economy actually got better Basically It felt like driving in sport mode all the time, except for the exhaust-sound.
this is the one i used: 309kW (420 hk)
First off, the RS4 like the R8 has two seperate ECU's that need to be tuned. Having said that I would recommend Tony @ PES Tuning (PES - Performance Engineered Systems, LLC) as he has access to the factory Damos files, unlike a lot of other tuners.
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