I have an 03 400ex and its in overall awesome condition except the plastic and it's red right now but I think i'm going to order all new yellow plastic for it soon. But, I was wondering what I could do to beef it up and make it a better overall machine, while not spending a lot of money. It already has an HMF pipe, and i've considered getting an airfilter, but I dont know what to get. I mostly trail ride and occasionally go in the water and mud. Any good upgrades? Or anything in general?