Exhaust Bbk Catted X-pipe Vs. Bbk Off Road X-pipe

Sure this has been beat to death but I couldnt find it searching. I have BBK Long tubes into a BBK Catted X pipe on my car to pass emmisions. I had the BBK x pipe on it. Now it is much quieter. I made 370 HP out of my 347 at the rear wheels with the Off road X-pipe. They are running into 40 series flows. How much power are the Cats costing me? I plan on doing 2 passes with them swapping out and doing to passes with no cats. If im running the same times better to be green I guess. Car really does sound like crap and smells funny. Let me know if anyone has dynoed with these two setups.

Ok smell went away it must have been from them sitting around in a garage for years. Buy crap I meant much quieter than before. Power feels the same to me. It is almost to loud with the cats off. Maybe I'm just getting old. Either way I'm not going to the track in it. I was just woundering how much of a differance in power it really made.