modifications to audi s4?

Q: i was wondering 1) what are the 3 cheapest mods to increase horsepower? 2) what are the cheapest black rims.. (within reason) 3) cheapest good sounding exhaust.

A: 1. Cold Air Intake, Exhaust System, Performance Chip. 2. www.tirerack.com shows over 50 rims that you can see on your car on the website. And it shows cheap prices. 3. Exhaust Systems that work well on Audi are Milltec, ABT, Neuspeed, and Borla and Injen and AEM and HKS. I think AEM and Borla are cheapest.

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