Got this filter for free along with buying my KLX110 HD springs. I was hoping I could somehow use it on the KLX, and it fits perfectly on the stock rubber boot that goes from the carb to the airbox. Pull off the factory airbox but pop the rubber boot out of the airbox and leave it in place attached to the carb. This filter fits perfectly onto the rubber boot. I like it because it's not stuck right behind the front fender like the pancake filters, it tucks nicely in the big opening left by the airbox removal. Probably flows more than those pancake filters, and way cheaper than the BBR Uflow....