Just did all the mods on my 2007 WR450, installed DRD Full Race Exhaust, removed airbox snorkel, disconnected grey wire, changed to YZ throttle stop. AIS is next but waiting for the 07 kit. JD Jetting:170, 48 jets and blue needle. I am at sea level / Caribbean climate. The bike abolutely rips. I am very pleased. This is my first WR so I am not sure if this is normal... At 40 mph or more at a constant throttle, the feel is not smooth and the bike kinda sputters a bit. Still breaking the bike in so not sure if this will smooth out. I dont expect the WR to be as smmoth as a street bike but I am just a little concerned and wondering if I need to simply adjust something. Thanks, any help would be greatly appreciated.