okay I was told by my local exhaust guy that by putting two cats on my mustang (98 Gt) that it wouldnt pass inspection, because it is made for at least four cats, and I would need at least four to pass inspection. I live in NC and would anyone know the story behind this... I mean I thought that as long as I had two cats on there in NC that I was okay, but am I wrong? People can yall help me out?