Well I got a Turbo 2 engine (4 port of course) S4 I think,Fully bridgeport ,racing apex seals ,exhaust done and new bearing anyways engine gots power but very loud so i think an s5 turbo would quiet car and still maintain power, but looking to get an engine and like i said i dont knows if is a s4 or s5 how would anyone know, my rx3 in process of been restored So I took engine out and now thinking of getting a s5 turbo instead of a holley, What year is s5, I checked i Think is a 1989 turbo II im i Right, ?>sorry for going back in forth but my spanglish ,,tried my best to make this all english