Is there somewhere where a list can be viewed of turbos that can be used on a 2001 S4 along with price, flow rating, and amount of hp and tq that can be made without putting to much strain on the turbo?

 

why dont you do searches before posting this beaten to death question??? [sm=dontgetit.gif] its so easy...go tosearch, then type in turbo for 01 s4....

 

K04's are most common a full stage 3 K04 set up will run about $7000.00 400 to 550 hp
You can get a GT turbo set up for about $12,000.00 to $15,000.00 600+ whp

An S4 with a chip, turbo back exhaust, intercoolers and a bypipe is nothing to shake a stick at. With those mods alone you will be able to show 95% of cars on the road your tail lights. I have seen video of a car with this set up run 12.9 at the track. This can be done for under $3000.00