Well I've got about 3500 miles on my slashcuts and they just keep getting better - sound and speed wise. The improvement over stock is amazing. Didn't rejet, didn't do anything to the airbox, just put on the pipes. Last road trip I turned 48 mpg and was running at an indicated 75 - 80.
The only downside is the noise - these pipes are loud, BUT mine are mellowing with age.
What's your experience with Bubs?
roadie