sup guys just wanted to put in my .02 on a new part i put on my 450r. i got a hrc "clone" end cap on my 450r this weekend and rejetted to a 180 main ( BIG DIFFERENCE IN SIZE ) and moved the needle up then cut out that part on the stock air box so it looks like the hrc air box lid. it made a pretty big difference. my first gear does not feel as tall anymore it takes right off. i can lift the front wheels now alot easier than i could with out the mod. the end cap was like 34 bucks on ebay and the jet was like 6 bucks cant beat that. sounds alot better too.