You have many non-race options. Dean from Keda Design builds excellent exhausts, and is a sponsor on this board. You also have GB, D&D, Jardine (if you're cheap and unwise), and more as other potential aftermarket options. Then there are the modded stock cans: Spec OPS (please don't), Drummer, Hawk (another forum sponsor).
I would probably go with Keda or GB if it were me.