lol i like the o/r , but i have long headers which quiet it down. also i put the baffles in that came with the bassani catback, sounds good. how are those stingers?
i would go for it, the bassani cats are nice, theoretically it could mess your tune, but i dont think it would be anything too significant, especially since you are not running a power adder, huge compression or anything like that. the car should run richer with no cats, a bit leaner with the cats, but id think you would be alright.
its up to you though