Ive decided I want to start building my car. There are so many things I want to do, but I always get stuck somewhere, If this I can't do this then I have to revision the entire thing.

I want to replace my Turbo Manifold with a Top-Mount Manifold, slap a GT35s Turbo, connected to a 3" USP test pipe to 3" USP downpipe, to 3" exhaust, with an S4 valance with Quad Tips.

Has anyone else done a top-mount? if so, where can I get a readily available 3" test pipe for the top mount manifold?

Thanks!