59K on my road king with true duals, white brothers slip-ons and screamin eagle air filter kit. all parts put on when the bike was new. plugs run a litte sooty so i know it's not lean. i don't see the need to have my upper RPM limiter set higher when i have never been above 4K RPM. an engine is a pump and will only move so much volume no matter how freed up the intake and exhaust have become.

 

Had the pc111 and the sert (scremin eagle race tuner). Actually like the sert better. Suprised me, but it has alot to do with who tunes it!!