I just bought a Bluebird turbo manifold and T28, according to what the guy i bought it from says. The intake outlet faces foward. I was wondering how to tell the difference between the U12/U13 and GTi-R manifolds, and what turbos came on what? And how do you tell what turbo it is, like numbers on the housings? All I know is the A/R is .80 . Any info/pics would greatly appreciated.