Fit this over your Twin Air filter when riding in severe conditions such as heavy dust or sand. This coarse foam pre-filter will act as an additional layer of protection and extend the service time between filter cleaning.
A Pre Oiled filter is submerged in Bio Liquid Power Oil and massaged to ensure all the pores are evenly coated. Its then placed in a temperature-controlled room to allow the oil to cure. You just have to install it and use it.
Check out the following Twin Air videos