I dunno, ive read its supposed to be REAL EASY but we worked on it for 3 hours with no hope. No socket will fit over the stud and nut and still clear the frame, let alone the universal in there. The only way i can see it working is to remove the O2 and then get a wrench on the nut

also my o2 sensor is pretty much stuck in there. we used the 02 socket and it won't budge. Used pb, and also warmed up the car for 10 mins till it was to hot to touch and it still wouldn't budge. I know we can get it out but its a pain in the a$$ to have to change every year. also from what i understand the cats don't rob to much hp on an after market mid pipe am i right?
The reason i wanted the h instead of the x is because of the sound not the cost, but i guess im stuck using the x. Will the x still have an old muscle car sound or will it be raspy?
thanks again