its 96 decibles for exhaust.....im a licensed maine state inspector.....the rule book is available online.....the purpose of an inspection is for safety and tech. the rules are the rules and there are no deviations but some people are more easy on you than others.....i myself am strict when it comes to saftey items, because if you die or kill someone due to a failure that i passed i become 100% liable, not you. its my ass on the line. there are some dumb laws, emissions to speak of...i could care less if im recirculating gas fumes....a simple rule of thumb is if it looks like its illegal it prob is and even if you do get a sticker your car can still be torn apart by the state if they think its illegal after an inspection.....