what is the difference between a H-pipe and off road H-pipe and X pipes?? and do u get better performance w/out cat converters??

 

w/o cats and x pipe!

 

Regular h and x pipes leave the cats in place. Offroad pipes eliminate all the cat converters. A slight gain may be seen by not having any cats but it would be minimal. Our cars have 4 so they could stand to lose a couple .