RevOD,
not sure if you have an exhaust system yet??
But if not,, might I would suggest as big as you can fit.
Like 3" would be nice.
For the downpipe from the turbo use stainless tubing.
Tlowe: says you can get used Ford,Powerstroke diesel downpipes on Ebay cheap, because those guys are upgrading to larger downpipes and selling there old units.
As for a muffler, get one with a straight through design.Remember back pressure is bad for a turbo.
When you add a turbo or have a turbo car, the turbo is like having a muffler already installed, it really makes your exhaust sound quiet.
Hope this helps a little.
MBHD
