I didn't want to pay $600+ for a few feet of pipe and a muffler so I made my own cat back system. I have used a Dynomax super turbo before and liked it so I went with that. No resonator but it is not loud at all.
[quIte="Fiat slayer, post: 15868, member: 84"]From the cat back and also what tip is that?[/quote]
It is from the cat back. The tip I picked up at the auto parts store. 4.5 inch. It looks like a resonator tip. I don't know how much it actually does.