I found a nice OEM F2 muffler on eBay.. would love to slip that thing onto my F1 (with old D & D that I don't love too much). Do you know if the F2 muffler will fit the F1 bike, and if yes.. will it work okay with the original F1 motor ? I have a feeling that the D & D on my bike might be making the engine have a few rough spots during acceleration and would love to try a stock setup for a bit. It looks like maybe I could adapt the mounting system from the D&D to work with the F2 muffler if the mounting points differ. I am not sure if the end of the pipe will line up with the downpipe, though. Any thoughts are appreciated.