On Friday morning my PC Ti-4 lowboy system came in, Friday afternoon it was installed. Didn't get to ride it until Sunday but it was worth the wait. So far I have installed a Twin Aire system, Hotcam, JD jetting main and leak jet and now the PC exhaust. This bike rips! It has power every where. I am 200 lbs. and it pulls me without any bogs or hesitations. If the rpms drop a quick stab at the clutch and the bike is pulling hard again. I am easily able to run a gear higher than usual in most situations and the bike seems to have much more top end. The bike is putting out substantially more power now, where I might hit the rev limiter before I now just upshift and let the bike run thru the meat of the power band. This bike just continues to amaze me! After I had Race Tech do my forks and shock I thought things couldn't get any better. But with it running the way it does now I am one happy camper. I purchased a 06 head and am thinking of a porting job and a hi comp piston but with the bike running as well as it does, I'm thinking my next mod is a Rekluse Z start clutch anyone out there with any experience with the Rekluse let me know. Valve probs or not (I've never had any), I love this bike! If the thing needs valves, ever, I will happily replace them and go on riding.