Does anyone know if a 2006 yz450 header would fit on a 07 wr450? I already have the 2006 yz muffler and it fits the bike as is, but I'm wondering if it would fit where the header connects to the head of the engine. I know the yz header is slightly bigger in diameter than the wr header, and that's the reason I would like to put one on my wr. I'm just not sure if it would fit the WR head. If it does then I would have a full yz exhaust, much cheaper than buying any other aftermarket exhaust for the WR. I'll appreciate any info I can get about this.