Cool guys thanks for the advice, I guess I’ll have to make some slight changes. Sounds like I’ll plug the two holes and get a longer, nicer silencer and run the ole girl. I thought SKUSA was open air filter for stock moto; they are making 42 hp out of the “stock” engines and are probably running at 90 decibels. I guess this track like you said has very strict ordinances to follow. It’s still a bit of a bummer, I guess the greater Boston area is in need of some more sprint-karting venues.