I've done the throttle stop, and put in a james dean jet kit (tremendous results, and unplugged the grey wire, and unplugged the exhaust ) on my 03 WR450... Oh, and I put on my ProTapers, and Cycra's this weekend as well.. So the only one left (for free) was the airbox boot.. I spent saturday trying to get the lid off the airbox.... I had the whole subframe disconnected.. exhaust pulled.. but failed to get the lid to fit up through the subframe.. so I put it back together.. THEN I just re-read the free-mods section for the 20th time.. Correct me if I'm wrong.. but the air box boot was not on the 03WR??? my only options are to put more breather holes in the sides of the box?