so how do you calculate how far the sound travels out of a bike? im getting a honda cr125r that has full on racing everything and want to see how loud the bike will be at a distance of lets say 100 yds? how would i figure this out, is there a formula or a online calculator that i can plug my info into? also can a shop tell me what DB level im putting out from my bike? i really want to know since im thinking of getting a fmf "Q" exhaust.