I bought a set of the U.S. Spec mufflers and there is a remarkable difference in the sound between our Ozzie Mufflers and The U.S. Ones.
I can't comment on improving the performace at the moment as they have literally just been on, but at least the bike sounds like a Harley now.
I had my son on the back yesterday and captured what the mufflers sound like before wind was an issue with my camera.
any of the mufflers with a "big hole" left that suit a fxst 08 ?
I already have headers and have fixed the flapper valve, but the mufflers sound pretty good, especially if I can drill out the bung that blocks the pipe.