I installed a cfr pipe & cfr optimizer on my bike with a k&n filter & no top.seemed to run good at mid range & top end.no real bottom end power untill 5 or 6000 rpm, then it would start to break up. It was driving me crazy. I'm adding thunder monster baffels & changing to a pc3. I think the back preasure will help the bottom end. any feedback would be appreciated.