I have and FMF Power Bomb front pipe and Q4 muffler that I put on during my winter rebuild., pumper carb, cut airbox with a K&N.
It does run well and the FMF system is much ligher than stock.
After a few short rides totaling 20 miles,doing some checking before I go longer, I have found the FMF system to be way too loud for my liking.
I will be selling the Q4 rear section in FLea Market and going with Jesse's TB mid pipe and a GSXR can, which is what I wanted to do and should have done in the first place.
Too bad that there isn't a quieter baffle option for the Q4. It is far from "Quiet Core" if you ask me.