I have had the b6 s4 for a year now. I love the car... However, be prepared. I will state it again, be prepared for the most expensive car you will ever own maintence-wise. Window regulators are notorious for breaking. Cost me aprox $750.00 to have two new ones installed. Oil chg w/ synthetic oil $120.00. Rear hub replacement $850.00. Everything is hard to work on because that V8 is jammed in a little car. Also, if you drive it like it wants to be driven, expect to get single digit gas mileage. (drinks gas) Lastly, other replies are correct in that there is not much mods for this car. Intake, chip, exhaust is about the only cheap mods. If you want to spend $10,000-$20,000 you can add a supercharger.
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