Sprint Air Filter Sprint Filter with PO8 has reinvented the concept of a special air filter. Unlike materials like cotton which fiber breaks easily or sponge that is inconsistent under pressure but an innovative polyester material that allows an air passage to be constant and calibrated. Sprint air filter is totally different from others. There isn’t a filter in the world built with such technology. The membrane filter consists of a fabric of polyester threads from Ø microns. What’s more, the filtering surface is doubled than any other special filter. Here’s a microscopic shot of the cotton filter and PO8 polyester in comparison. Sprint Filter PO8 is an air filter that provides a zero-maintenance practicality. Just remove the filter from the airbox, blow it clean with compressed air and re-insert it in. No washing or oil treatments required! Sprint Filter PO8 air filter, if maintained in the correct way, will last for the entire life of the bike and will no longer be necessary to replace the original air filter. Sprint filter PO8 was born in races. World Championship like MotoGP, Moto3, Superbike, Supersport and Superstock is constantly using PO8 filters.