I bought a White Brothers Aluminum Pro Exhaust System for my 2004 Yz450 and it seems I have a little hesitation on the bottom. As soon as I roll the throttle past that point there is no problem. Has anyone bought this system and had to make any adjustments for it? Does anyone have any recommendations on changing the handlebars? Instead of changing the clamps, I was going to buy the Pro-Taper clamp extensions and change the bars as well. I was told the Windham Bend was good, just looking for some thoughts on what bends are being used. Any feedback is appreciated.