My buddy has a 04WR450, some where I saw a full airbox modification with photos and how to. Anyone remember where I saw this? Was this in Dirt Rider? If so what month anyone remember? Or is the step by setp online? I will need to print it out. He is not computer savvy. Thanks for all your help. Additionally, he removed the cork in the tailpipe, is rejetting necessary or just adjusting the needle? Thanks again.