[EF You]

dood some people needa read that large ass explanation of exhaust they have floating around AF somewhere. backpressure is bad no matter what. its delta pressure you want, which technically measures the absence of pressure between exhaust pulses, AKA scavanging. i say gut your cat, weld a pipe inside it (making it look like a cat but function like a straight pipe) then get straight 2-1/4" or 2- 1/2" stainless from your new "cat" to the back, but dont let them make the "bend of death" around the gas tank. instead of running it like the stock exhaust, run it without so many 90 degree bends, just go around the gas tank and come straight out the back on the passenger side, or go the other way around the gas tank and come out on the drivers side (although with this you are gonna needa do a lot of heat shielding cause your gas lines run on that side too)