Alright heres the deal, I just picked up a DB7 about a week ago for 3500.

Under the hood:

b20b block (less than 600 miles)
GSR Tranny/ACT stage 3 6 puck clutch
P72 head-
skunk2 camshafts (not sure if its the pro series or tuner series but will find out)
AEM cam gears (blue)
skunk2 pro series intake manifold
skunk2 valve springs & retainers
not sure about the pistons i believe it has b20b pistons cause the guy i bought the car from had a turbo on there(which he included) but i wanna run n/a for now

So right now all the car has is a shitty header; no cat no piping whatsoever.

And my question is what would be a decent exhaust setup? I was thinkin about running 2.5" piping to a stock itr muffler no cat. Any suggestions?