Putting a t28 on a top mount manifold really serves no purpose other than looks. The turbo will not function any better or gain any efficiency. You'd basically be buying a t3 manifold hacking it up and modifying it to accept a t2 flanged turbo. You'll also have to make a new exhaust housing, inlet and outlet piping, re-clock the turbocharger, and re-route all of your oil and coolant lines. I honestly think it's a pretty stupid idea, not to mention it will look retarded with such a tiny turbo. If you want the "big turbo" look. BUY A BIG TURBO!