What I wrote about above are some of the most common issues. A few others might be the wheel bearings, MAF sensor, O2 sensors, EGt sensors, and tie rod ends. These are the most common and don't always happen. I've had some of these things happen with the car I have.

Upgraded parts are not cheap, and neither are the stock parts for the most part. Check out www.ecstuning.com or www.awe-tuning.com for some pricing examples.

A simple example would be the turbos. To replace blown turbos with what came in the car would be at least $2000 in parts alone.

To replace blown turbos with the stock RS4 turbos is another story. The turbos alone are only $200 more than the stock turbos but the upgrades to make that upgrade worthwhile are going to cost you anywhere from $4000-$8000 when all said and done. Of course this is still parts only. Labor will really cost you an arm and a leg on these cars.

Exhaust and a chip are always a good place to start on these cars. Handling is something you might be interested in when you start going faster as well.

expect $600-$800 for a chip upgrade, anywhere from $600-$1200 for a cat back exhaust. Of course cat back doesn't include the downpipes which normally run aroudn $1400-$1700. or you can get piggie pipes for around $400 here www.vastperformance.com ... which reminds me motor mounts are a problem as well...

start to get the idea?