If you are like me; building a streetable CB and dig the megaphone look, you have probably struggled with megaphones that work well on the street. Look no further than a VW shop. The "stinger" exhausts with removable baffle are just about the right diameter as a megaphone. 1.5-1.75 in and 3.0 out and aprox. 17 inches long. Haven't road tested it yet, as the bike is still under construction. Pics will come when the exhaust gets all welded up.