Heres what I want....

A fast S4...What do I need to do in order to achieve this desire.

Right now I have an M3 - my luxury sports car, and a highly modded WRX with around 300awhp, coilovers, big brakes, bunch of goodies.

So, I want to combine the styling/luxury and refined nature of the M3, with the AWD, high HP, and raw performance of the WRX. Hmm, S4? Dont be too flattered, i know its got plenty of its own issues. ANYWAYS..

Couple issues, I dont wanna spend much more than $17-18k right now. I dont plan on having an M3/WRX hybrid right off the bat, just eventually, but none the less I need the platform so i've got to start somewhere.

I've found a few S4's in the area going for the mid-teens ($14-16k) with mileage ranging from 80-100k. I know reliability on these things isnt Toyota-like but I do know that mileage isnt a make it or break it type of deal. If I pick up one of these with such mileage, and the timing belt/water pump issue has already been taken care of...What else do I need to worry about?

In addition, once reliability is out of the way, where do I start with mods in order to get me in the 300whp ballpark - Chip, TDO4's, what else? Lastly, do they make FMICs and fully catless exaust systems for the S4's?

Any help, suggestions would be appreciated, thanks.