air box lid

[EX400rider]

With my K&N should i keep air box lid on or off. Wat differnce will it make??

big diffence... as long as you have a propper jet.

[2004exrider]

big difference, but get a outerwears for it

depends on where your ridin i only leve it off if im goin to a track but you also gatta make sure to clean your box and filter alot