Yes, you could change the chip back, but they do look at the exhaust system here in this area. They failed one guy with his car because he had an after market distributor. It passed the tail pipe test great but they told him he had to put the original distributor back in. The original one had broken and he took it in and showed it to them and they still refused to pass him until he got one that said Chevy on it. After he got the one they wanted the car still passed but at almost double the emissions it had the first time. Really shows how concerned they are about this crap doesn't it. I think this area here is one of the worst, if not the worst in the whole state.
Ron
