Hi Everyone, I just got an 06 wr450 that is close to brand new. Tearing is down to service everything, install pipe, DS kit, yz cam, small battery etc. I was planning on taking the top off the airbox and mounting the small 4 cell battery on the inside of the airbox. I did this on my last 05 a had a few years ago. Is there any advantage of using a yz airbox instead? It looks like the yz has a larger opening and has no lip in the back. The air would flow in better from the rear fender vents. I could make a mount for the relay. a 03-05 air box is like 20 bucks on ebay so since i have everything off the bike I just wondered if it would provide any gains and if anyone else has done this. Thanks.