haha over my head completely. We only have 1 local track thats strict about noise, but here we dont use decibel meters, we use "your bike sounds too loud". Really consistent.I think you missed the joke. The street noise level is usually more stringent but is not enforced. The funny thing about it is Yoshi makes race exhaust but it does not meet the track specs. Yet they still are able to sell them. Some tracks here that are AMA sanctioned test the motocross bikes before the race, no pass no ride. It is usually dependent on the tracks to enforce or not.