OK, guys, a little help here. I've searched the forum for the answer...but can't really find it specific enough to satisfy myself before I drop some coin. I want to install an autodecompressor exhaust cam in my 01 WR426. After 6 1/2 years of mechanical engineering school (BS and MS in Mechanical Engineering from Cal Poly), I just can't convince myself, maybe because I don't have enough of the right info, that installing an 03 WR camshaft in my 02 will last forever. I've heard that not only is the pitch circle of the cam gear different (which, by itself isn't necessarily and issue), but that the tooth profile is as well (which could be). My anal retentive Engineering education just won't let me do the swap without the answer...are the tooth profiles different? Yes, I know that folks have had these installed for thousands of miles, but I'd always be wondering, and piece of mind is worth the extra coin. If the tooth profiles are different, I'm gonna be a chicken, and find another solution. Here's the next question...whilethe Hotcams website doesn't specifically address the cam timing issue, I assume their cam is YZ timed as it's applicable to both WR's and YZ's. What does that do to the power delivery of the WR? I have read several posts about the hotcams, and everyone says stuff like "You'll love the power" and "after you install the exhaust cam, you'll love it so much you'll go get the intake cam as well", but what IS the powerband like with these installed? I do mostly desert, trailrides and am starting to do some DS rides. I'm a mid-fourties, maybe B (on a good day) rider with arthritic knees. I love the power delivery of the WR as it is, and don't really have big enough balls to use all of the power, so I don't want to dork things up by putting in cams that take from the bottom and nice, smooth delivery, and add a big mid-range hit. I would appreciate any feedback both on how the HotCams (both the intake and exhaust) alter your riding experience and powerband, and the tooth profile question. Thanks, all!