Thanks convincor253, but I already have a Gil Silent choice system, which I think has only been on the quiet mode twice. The solenoids that open the system to the thru hull went bad, so just looking for the solenoids, Gil direct has them for $80 each, seems a little steep, but thats boating. As for the law, A Sargent from the DNR said Silent choice is basically illegal in Mich.
BUT two factors can make them acceptable.
1. Must have cold water drawn and run through the exhaust
2. not exceed state decibel standards
Hope that answers some questions, I appreciate all response, I have more details, but wanted to spare everyone from an excessive reply, I know