Our AWE Tuning S-Filter is a drop in, high flow replacement for the restrictive OE paper filter. We chose a reusable oiled cotton filter because they, by design, flow more than the paper equivalent. Follow our recommended cleaning intervals; listed below; and you will be able to enjoy years of improved breathing with a single filter. Emmett Fox, who leads AWE Tuning??s on-site installations, states, ??Fit, finish and function is top notch, making installation a breeze. This is a great upgrade for the daily driven vehicle.?? Our S-Filter has been tested against competing aftermarket drop in filters with favorable results. Designed in house and manufactured by an OEM tier 1 supplier to our specifications, this is the largest possible filter compatible with the factory airbox. Featuring a large face cylinder shape our filter has more surface area than its cone shaped equivalent. Note: Recommended cleaning intervals for the filter is 10k miles or once a year, which ever comes first.