Check the rules before you buy any air box. I don’t think the freeline and other 2004 homolagated are legal.
Rule 2.2.1.
AIR BOX – OPEN, but must be CIK or, RLV approved air box with two inlet tubes not to exceed 22.0 mm (+/- 1.0 mm) inside diameter and 95.0 mm minimum length. The 2004 homologated CIK, KG and Freeline boxes are not legal. All air boxes may not be modified although the rubber flange may be trimmed on the inside of the air box to the flange lip. Aftermarket internal foam air filters are allowed as long as no modification is made to the air box it?s self. The position of the airbox is nontech.
Bill