13-17 KTM 85SX: Twin Air Power Flow Filter The Twin Air PowerFlow Air Filter is a great way to boost the horsepower and performance of your motorcycle.Twin Air designed their PowerFlow Air Filter to be used exclusively with the Twin Air PowerFlow Kit. The special backfire-resistant layer of foam laminated to the inside of the filter makes the Twin Air PowerFlow filter a quick, ready-to-install assembly.The same factory treatment that race teams and O.E.M.'s receive is now available for all Twin Air use