Yes, the 450 is a WR, and had it been the motocross version, it would have beaten the 300. Not, however, were the 300 a 450 also, as I've suggested. In that case, it would be considerably quicker than any motocross 450 4stroke, but with the rideability of the 300. Same type of power delivery as the 300, just with 150cc more in displacement. I'm only suggesting that such a bike would eliminate many of the complaints currently directed towards big-bore 2strokes like the CR and KX 500s, such as being too explosive and hard to control, as the 300 is very mildly tuned compared to a normal MX 2stroke. A 450 version with pretty much the same configuration, would still be very controllable, could lug or scream, would be faster and more powerful than any 450 thumper, smooth and tractable too boot. That seems to be what so many modern testers want these days and what they claim works for motocross tracks in their current design. Not being a motocrosser or woods rider, that isn't what I would want, I'd want all the horsepower I could wring out of the thing, but I was suggesting such a motor for motocross, and I think it would consistently beat 450s around a track as well as be easy to ride and not so tiring to ride for long motos. Of course, I doubt they'd ever let anyone ride it in a pro level MX race, but it would prove that twostrokes can be smooth, tractable, easy and non-tiring to ride, and still considerably more powerful than any 4stroke of the same displacement. Doesn't anyone follow my reasoning here?