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Terrafirma Pre-Filters

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Outerwears Pre-filters are designed to enhance the efficiency of any performance or exposed air filter. The pre-filter is constructed with a proprietary polyester mesh with uniform micron openings, treated with a water-repellent process. The mesh is UV resistant, filters debris down to .005, is shatter proof in freezing temperatures, and resistant to heat up to 450 degrees ! Pre-filters are designed to deflect the damaging debris, which clogs air filters, compromising peak air-flow and horsepower. The Pre-filter also extends the time between servicing intervals reducing costs and increasing convenience.


How often do I need to clean the Pre-Filter?
Once again, depending on driving conditions, service intervals may vary. We recommend you make a visual inspection as often as you would normally service your vehicle. If you are an off-road racer, we would recommend viewing the Pre-Filter at least after every race. If you can see a significant amount of dirt, you should clean the Pre-Filter. If you are an automotive enthusiasts and the only driving you experience is the street, we recommend checking the Pre-Filter every 3,000-5,000 miles. Although your Pre-filter may not require a thorough cleaning, you may want to shake off any excess dirt to maintain your optimum horsepower and fuel efficiency and then simply reinstall.

  • Depending on driving conditions the Pre-Filter should be inspected at least after every race
  • Street use every 3,000-5,000 miles
  • After inspection and the filter looks a little dirty --simply remove, shake off and reinstall

After inspection and the filter appears to be loaded with debris --remove and wash with Filter Cleaner allow to dry and reinstall

How do I clean an Outerwears Pre-Filter?
The best method for cleaning an Outerwears Pre-Filter is to shake off any excess dirt and wash by soaking for 10 minutes with filter cleaner. After soaking, agitate the Pre-Filter in the cleaner solution and water to remove any remaining debris and grime. Once the desired cleanliness has been obtained, shake off any excess water and air dry. If caught on a road trip or during a race without access to filter cleaner and water, you can also remove a significant amount of dirt by simply shaking the Pre-Filter and allowing the excess dirt to fall off.