hey guys, I got a question. a friend of mine has a 1990 90q (not 20v) and was telling me that you could put an S4 engine 91'-94 into the 90q because its basically the same motor. I don't think so. I've seen the S4 to me they don't look alike. Could some let me know if this is possible.and what's the differences between the turbo 5cl.and the NA. Thanks Winslow Douglas 88 90q Toronto Ontario