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Auto Air Filters Kart Air Filters Economy Kart Filters Breather Filters

The HDM UNI 2-Stage foam filter outperforms the competition providing greater air flow and superior protection.

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.

If you would like more information on foam air filters, please download HDM Filter Information PDF file.

Be sure to download and print the oiling instructions for the foam air filters.

HDM nor UNI will be held responsible for any engine failure due to improper or unapproved use of any UNI filter.

Along with the 2-Stage Foam, HDM also offers the economy kart filter

HDM offers 2-Stage Foam air filters for both Kart and Auto Racing applications.

5.5oz Filter Oil Aerosol...  $5.50ea



Spy Optics available online.

Thor Oil and Tire Prep now available.

Hyper Coil brand coil over springs are now available

Digatron Gauges and Instruments online ordering.

Rivets and Sheet Metal now available.



 Latest Updates...

HDM has added the following to our product line.

Karting Jackets

FSR Radiators

Racing gloves

Braces & Supports

Racing  Wheels




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