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on drags the 450 would win stock for stock but if you get a pipe, jet kit and k&N filter on the 400 and the 450 is stock you could beat it if you ride pretty good.
c'mon now, thats not a hard question at all, you know the z400 for sure [img]i/expressions/face-icon-small-wink.gif[/img], lol just messin, yfz 450 in everything, no doubt about it