Twin Air 158041c Power Flow Air Filter Kit Fits: Gas Gas 125 Enduro/Halley/SM 08-13, Gas EC 2-Stroke 200/250/300 Enduro 07-13 The best filter in the world can't do its job if there are leaks in the seal of the air box Dual foam design: Coarse open-pore foam catches airborne dirt, grime and sand, fine open-pore inner foam acts as a second filter to trap the smallest particles while ensuring maximum air passage Replaces your air-restricting stock backfire screen with the power flow kit The kit includes a rigid, lightweight, billet aluminum cage with a special backfire-resistant layer of foam laminated to the inside of the filter