This is the Ultimate Racing dual-stage foam air filter, and it's been specially designed for use with Xray XB9 air filter. The combination of this dual-stage foam air filter with the Ultimate Racing air filter oil guarantees the maximum air flow and offers an excellent air filtration and protection for your engine. Available in economic packs of 6 or 12 pieces and safely stored in a double zipper bag, so can be stored for long time and ready to use when you need them. Air filter oil not included.
