carl
i was going to do this mod to my car a while back and when i went to have it done no one would touch my car. they were afraid of messen up a sensor. if you look right before your cat there is a sensor. i dont know how it is with the SHO Shop y-pipe but i think you would have to have a chip burnt especially for the cat. maybe i dont know what i am tlaking about. ok i am retarded.