Uni Air Filters based in the USA provided us with air filters.

Uni Filter Inc. has been a foam air filter manufacturer since 1971. They have developed into the largest maker of aftermarket foam air filters in the world. They produce air filters for Harley Davidson, Honda, Polaris, Bombardier, Arctic Cat, and many other motorcycle and ATV manufacturers.

Uni Filter Inc. entered the air filtration industry in 1971 with a simple concept, "Let's design an air filter that works!" The founders of the company chose to use polyurethane foam as the filtration media because of its superior dirt capturing abilities. Polyurethane foam had been used as a filtration media for many years, but not until Uni Filter introduced the patented seamless "Sock" Filter for motorcycles and small engines in 1973 did it receive mass acceptance. This dependable High Air Flow Filter launched a product line that now covers virtually all popular motorcycles and ATV's.

Foam filters were in their infancy in the early 1970's. In the 1980's and 90's their "High Air Flow" and superior filtration abilities made them the choice of every dirt bike and ATV manufacturer worldwide. Many high performance street motorcycles have also made the switch to foam air filters because of the superior performance advantages of foam air filters. Uni Filter's cutting edge technology, along with this proven superior filter media, is the perfect team to address any filtration concern for the 21st century.

Why foam is better?

The principle of how foam air filters work is simple: "Open Cell" Polyurethane Foam is wetted with specially developed filter oil. The "sticky" filter oil is suspended in the path of the dirty air on the strands of the web-like cell structure of the foam. This makes it impossible for dirt to pass through the depth of the filter without sticking to the strands. As the outer strands become loaded with dirt particles, the wetted strands down stream start trapping dirt, allowing the entire thickness to be utilized. This prevents surface loading or air restriction for 80% of the service life of the air filter element. When the filter is sufficiently dirty, it can be easily washed, re-oiled, and re-used.

You can buy Uni Filters direct from their UK dealer: Straight Line Racing at: http://www.straightlineracing.co.uk