how do i get optimum flow into my airbox
What bike do you have? The new WR has a restritor in the top that can be removed. I always cut out the backfire screen in the filter cage as well. You could buy the one that's offered without the screen but it's super expensive!!! There are also templates on the right side of the air box on the new WR for cut outs or you could make your own. I don't recomend that if you will be doing much water crossing. Do some searching and you'll find all the free mods. check out www.off-road.com/dirtbike/ and check out project WR450F for lots of stuff.
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