They were pretty impressed. One girl said it was too loud and asked if I cut holes in my mufflers...hahaha!
Yeah...I think a full 2 1/2 inch catback would give no more than 5 rwhp or so. I just welded in the packs in place of my stock mufflers on the 2 1/4 inch pipes. I'm guessing between the o/r X and the packs I gained between 10-15 rwhp. I did it mostly for the sound, but a few ponies doesn't hurt either. My stock baseline was 231 rwhp, so i'm hoping I'm at 240-245 now. Probably more like 240 rwhp. That's 282 at the engine.