We get asked all the time about air filters and which one is the best. Of course we always say MWR but heres why.
There are 3 main types of filters used on motorcycles:
Paper (OEM Type)
Main article: Filter paper
Pleated paper filter elements are the nearly exclusive choice for automobile engine air cleaners, because they are efficient, easy to service, and cost-effective. The "paper" term is somewhat misleading, as the filter media are considerably different from papers used for writing or packaging, etc. There is a persistent belief amongst tuners, fomented by advertising for aftermarket non-paper replacement filters, that paper filters flow poorly and thus restrict engine performance. In fact, as long as a pleated-paper filter is sized appropriately for the airflow volumes encountered in a particular application, such filters present only trivial restriction to flow until the filter has become significantly clogged with dirt. Construction equipment engines also use this.
Cotton (BMC, K&N, etc)
Oiled cotton gauze is employed in a growing number of aftermarket automotive air filters marketed as high-performance items. In the past, cotton gauze saw limited use in original-equipment automotive air filters. However, since the introduction of the Abarth SS versions, the Fiat subsidiary supplies cotton gauze air filters as OE filters.
Oil-wetted polyurethane foam elements are used in some aftermarket replacement automobile air filters. Foam was in the past widely used in air cleaners on small engines on lawnmowers and other power equipment, but automotive-type paper filter elements have largely supplanted oil-wetted foam in these applications. Depending on the grade and thickness of foam employed, an oil-wetted foam filter element can offer minimal airflow restriction or very high dirt capacity, the latter property making foam filters a popular choice in off-road rallying and other motorsport applications where high levels of dust will be encountered.
Most filter manufacturers offer one type of filter, MWR offer 3!
1) The Performance air filter, exelent performance and max. protection. Clean and re-oil once a year.
2) The High Efficient air filter for road & race bikes, designed for inlet noise reduction . The revolutionary High Efficient Air filter is designed to reduce intake noise and increase power.This design of air filter has shown a reduction of up to 8db of intake noise compared to other sports filters. Unlike any other sports filter all inlets will get the same quantity of air, regardless the speed of the motorcycle or wind directions. No different fuel-mappings between internal & external or front & rear cilinders are needed. Clean and re-oil once a year.
3) The Full Race air filter, developed on the track, NOT on a dyno but in real life, bikes with Dataloggers for the ultimate performance due to new materials and design, protection is on the same level as the filters above, only for a shorter time. It makes the bike stronger but smoother, therefore it saves tires and fuel. Check the air filter every race weekend and always start each race weekend with a well oiled filter.
This air filter is not developed to reduce the inlet noise.
And finally heres a pic of a stock filter:
We stock all the MWR filters for 2006/2012 and 2013> Daytona's and Street Triples. PM me for a price or buy online.