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

Chuck33079

For stock block power levels, a 2.5 exhaust and test pipes will work fine. It's not the ideal 3" downpipe/exhaust combo, but it's not a bottleneck at <500whp.

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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

V1H

By "matching the down pipes to the exhaust" you mean matching the down pipes to the cats/TPs, right? I understand that after that there's still the X-pipe (true dual) or Y-pipe (single), after which comes the mid-pipe, ect.
I see many (catback) exhaust sold, starting from he mid-pipe onwards. That leaves the choice of X-/Y-pipe to me. And since the inlets of the Y-pipe will be smaller than the outlet, I do have to make sure the down-pipe-catalyser-combo mates to the Y-pipe inlet, but also the catback mating to the Y-pipe outlet, right? That is a lot of mixing and matching to deal with, no?
So which sections should ideally be 3"? all of them regardless of whether two pipes merge into one (single) or not (true dual)?

Alkatraz

A 'catback' exhaust should be exactly that, from the cats back. Including the y-pipe. The MHI kit will bolt up to the stock cats or any aftermarket cats/tp's that sit in the stock location.

If you are sticking with the stock cats, then you just need to worry about which exhaust you like because having the turbo kit wont make any difference to fitment. I run the Fast Intentions 2.5" and couldn't be happier. The only reason to go 3" is if you want to go for more power than the stock block can handle (550hp+).


Edit: Should probably move this to a new thread V1H. Don't want to fill this one up with too much off topic.

V1H

Okidoki, thanks so much. Both of you rep'd
I hope any HFC: Berk, Erz, Stillen will be fine.

Ah, feel free to delete my questions. You answered them :-)