Can you put the V6 from a RS4 into a B5 A4? If so, what other modifications would I have to make? I'm new to doing mods on my A4 even though I've owned it for a while.

 

You can put any engine in any car and make it work...with the right amount of money and fabrication. Best bet, don't bother. Even a VR6 swap with boost will run you into the five-figure range.

 

I guess what I'm actually trying to figure out is how much fabrication would have to be done in order for it to work? I'm looking to either rebuild the 1.8 or swap engines.

 

Search it, has been covered literally thousands of times. If it was feasible we'd all be running swapped 2.7tt's. There's alot of stuff thats vastly different from A4 to S4 (B5 RS4s were never sold stateside so I'd imagine getting a true RS4 V6 would be pricey).

 

i had this idea and needed to now if i would work ....i got a 1988 Audi 90 2.3L..is it possiable to drop a 1994 B5 1.8Turbo motor in it

 

See above maybe?