Only because we stock them, we replace the stock seals with Versrah fork seals (there are better brands to be had) & Filters we usually fit RamAir or Moose. Slip on Mufflers are usually Procircuit.
Unless your planning on turning the KLX into a submarine removing the airbox lid wont be an issue, as it is the stock lid only deminishes air flow & stops bugger all water anyhow, and as a whole the airbox is pretty well protected by the seat & side-panels.
A muffler, filter,& ditching the airbox lid are worth about 4kw & mostly in the mid-range. Getting into a big-bore header pipe, jetting the carb etc unleashes a few more ponys, but it starts to detract from the allrounder style of the bike.
The head shaking could be a number of things, but most likely the steering head bearings have bedded in & need to be retorqued.
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