they went to great pains to save every ounce they could but then you look at the pic and they made the muffler longer then on the 02 by a couple inches and even longer (possibly) then the ones on the 02 crf. In the mean time honda shortend theirs by about 2 inches on the 03 to about the approx. length of the 02 426. When a lot of us shortend ours this was a 2lb saving and yet they lengthened it. I think alot of you guys will be doing just what we did. Maybe this is Yamaha's way of producing a quieter bike for the enviornmentalists and tree huggers. Can you have both, quiet and fast? Now if I cut it shorter or replace it at the track (or privately owned closed circut competition course), I've probably lost another 4 lbs and Yamaha has done their due dilligince to produce a more enviornmentally friendly product without throwing on an XT600 muffler. I think its going to be a wicked bike, can't wait to hear how it rides!!!