The guys at the Sticker Station here in sanford told me that I was ok this year but next year maybe not. What they said was that the new OEM-only law was passed but put on hold, so they where going by the old db rules right now. It may change in the future.
In my opinion, the law is the law and if you can't prove that your exhaust is less than the legal limit, you have no right to SHE DOG when you get a ticket. A brand new exhuast is going to run you $500+ (yes, I know there are used ones out there) and you don't want to spend the $35 to get a certificate that says "yes, this adheres to maine law"???? That's pathetic.
Just like getting a ticket for speeding, you were braking the law, you got caught. Pay the fine, don't speed, don't SHE DOG. Live within the law, don't get hassled, end of story.