Hi, I've got 40 flows, but they aren't loud enough with my stock H pipe with its 4 cats and all. No one around here will install an o/r pipe and I can't do it myself, and I can't afford a new pipe with cats right now, so I'm going to have someone cut out the rear 2 cats and weld a pipe in its place. How much louder will this bring my exhaust with just the 2 pre-cats? A soundclip would be helpful if anyone had one.