I stopped by Bill and the gang several years ago and purchased a set. Everyone was very friendly. Im no help with your question, but I STRONGLY suggest hearing a set on an 1800. I made the mistake of hearing them on a 1300. After I heard them on my 1800, I sold them in a heartbeat. Hated the sound. With the dual pin crank, to me it sounded like 2 55 gallon drums on the end of the pipe. If you like them great. Sound is very subjective so hear them first before you shell out the cash. Good luck.