I have had my car for 2 years now but just now have got around to fixing it up was spending all my money on my svt focus but after breaking an axle and knocking a hole in the side of my block im finally gonna get to build it... now im wanting to stay rotary but wanting to put a turbo motor in it... i know staying in the same generation will be the easiest route i have done enough reading to know that however i am not certain about the s4 s5 differences and which would be best fro me im looking for about 450whp any advice would be much appreciated.....