I have a 3 inch cobb mid pipe mated to a 2.5 inch sti stock exhaust. The exhaust was cut by a muffler shop and had a 3 inch flange attached so it works with the longer cobb mid pipe. This makes for a great stage II setup that isn't too loud and is 3 inch all the way to the muffler.
I also have a stock intercooler with y pipes from a 2004. In good shape, 40k miles on it. And a psm 2004 wrx scoop. Prices are name your own, I just want to get rid of this stuff!
3 inch Cobb Mid pipe with worn flex section SOLD (Doesn't leak):
Wrx Intercooler with y pipes:
PSM Wrx Hood Scoop SOLD. (Paint is in near perfect condition).
3 inch flanged sti muffler SOLD:
Make me offers! I'm located in Southern, CA will ship at buyer's expense.