Forced Induction Finished Builds

V1H

Sorry to clutter this thread of eye popping FI builds with a noob question.
I'm gonna get the GTM MHI TT kit for my stock motor but don't know what exhaust I can have/must have for it. Neither do I know what down pipes I must choose.

All I know is that I like the Saclam exhaust best but no idea if suitable for a Turbo.
Is the 3" TDX Fast Intentions exhaust the definitive recommendation?
Are we talking dual 3" pipes or a single 3" pipe?
Would 2.75" or 2.5" also be sufficient? Again, for which, dual or single pipe?
And what about the downpipes? Size? what does it depend on, the diameter of the cat inlets/test pipes?
For the sake of passing emissions I'd be going with cat but the rest of the exhaust all non-resonated to get the volume up as much as possible (cf. Saclam's racey sound).

Thanks for advice