Twin Airs breakthrough, fused-dual-layer design (now widely copied) combines performance and protection.
The fused layers of open-pore foaming fine inner foam trap even the smallest particles. The new, rounder design and minimised shorter seams boost airflow.
Twin Air filters are assembled by hand and inspected for a perfect fit - Reusing a Twin air filter 40-50 times is common.
Fire Resistant filters have a backfire-resistant foam layer laminated to the filter which eliminates the restrictive, stock backfire screen.
Check out the following Twin Air videos
Please Note the photo is the standard Dual Stage filter, and the FR comes with a black inner foam.