what class does would my bike be?

I have a 47cc boreem (cag) pocketbike completely stock minus the pipe and air filter, if i were to race what class(es) would my bike be in?

first of all, is it a stocker replacment pipe or a hp upgraded pipe...?

its not completely stock anymore if you've changed your pipe other then the stock (airfilter dosen't really matter at most races) but if you were planning on racing here at the local tracks in my area, I'd have to say mod class. overall what it really comes down to is what the track rules are, each track may differ...

Out here, you'd be racing Open Cag with an aftermerket pipe. Check the rules with your local club.