Sorry, I put stock, but that is really V2 against V3 pipe. Those are 2.5", and the v3 removes the 3rd cat length, and has longer primarys. Here is the stock one :lol
They do make PCD, and now high flow pre cats at 200 cell. I dont think I am doing anything further than this and an intake, and little handling upgrades. Does pretty well for a car of its weight, just needs to lessen the body roll really.