TWINAIR Powerflow Kit CRF250 14-17CRF450 13-16Overview of Twin Air Power Flow Complete Filter Kit - 150222C- Dont let your stock setup rob you of power and engine reliability- Twin Airs Power Flow kit combines a larger Twin Air filter with a tough, super-lightweight flange that bolts tightly onto your airbox, eliminating leaks and providing more air for more power- Filter is removable and washable- 4-stroke kits replace the air-restricting stock backfire screen- Kit includes a rigid, lightweight, billet aluminum cage- Backfire replacement filter designed with a special backfire-resistant layer of foam laminated to the inside (cage not included)Included Items:(1) Air filter(1) Air filter cage