To fix the LC4 airbox, replace it with a Duke II airbox. You'll have to relocate the battery. I put a 5 amp one on the right side of the engine, but BajaDesigns is coming out with a very small powerful battery soon. The stock air filter is too small for any dusty condiditons. (same part number as the one from the 65SX) You can cut holes in the top of the new airbox, but cover them with silkscreen material (do not oil it) if you want to ride in dust much.