In California any kind of exhaust bypass or dump that isn't covered by a bolted cover can get you a big ticket. Electric dumps can get the car impounded. I watched the cops at last year's Kool April Nights car show going around looking at cut outs on out of state cars and telling the people that owned them they could not use them here in this state. Some guy from Oregon with a 1957 Chevy had to try it and he got about a block while leaving the show and was getting a ticket as I walked by.
Ron
