I just installed a WB Aluminum pro2 on my 07 450.. I rode it yesterday for the first time and really liked it alot... it broadened out an already broad power band it like made better everywhere. I called WB the day before they said i could run stock jetting so I did... it popped a little yesterday so i turned it out 1/4-1/2 on the air screw. Today i changed filter and and oil and when I was warming my bike up as I "brapped" the throttle it hesitates and sometimes pops with a little fire bolt... then I looked at my header and the thing was GLOWING red looked like an M60 machine gun after you shoot 800 rounds through it lol i only had it running for about 2 min and I put it in gear and ran it slowly just to heat up the oil faster. Any ideas?