Broke the bike in yesterday. Man, what a difference this thing is compared to my clapped out 2006! If feels so much lighter and the throttle response is INSTANT. It is too loud for my taste though with the powercore 4 so I ordered the quiet insert for it. Is anyone running the quiet insert? How does the mapping compare? I assume the insert will soften the hit a bit (which I am fine with), but will the FMF maps work just fine with the insert in there or should I be leaning them out to compensate? I'm running the GYT-R power bomb header and silencer with the 94dB QC insert. I'm using the FMF map with no ignition advance and the bike runs great.