Bought a new 2004 WR450F last Saturday. (Yea new, dealer still had two in the crates.) I've been reading here all week about the free mods and other upgrades and have a question. The AIS removal kits for sale (both on this site and by Yamaha) specifically say they are for '05's and '06's. Is the plumbing substantially different on the '04? (I did notice my air box does have the two indentations.) Any info on mods specific to the '04 would be greatly appreciated by an old guy who's been out of the dirt for (quite) a while.