I'm in for a track pipe in 304 SS, even better if you can put in a 3rd O2 bung., I have no emissions where I live, I don't need a cat or resonator. And I will say, from personal expirence with the intake Subikid made for me, the quality of his work is AMAZING! seriously people, buy these.
Any reason not to go with 2.5" tubing?
Also, if you have access to a mandrel pipe bender, USE IT!