AFE's Pro-Guard 7 filter media (read "material") is the most durable and reliable media manufactured. 5 progressively finer medical cotton gauze layers and two random porosity synthetic polyester layers protect your engine intake from boulders, rocks, gravel, dirt, dust, and microscopic cockroaches. The efficiency of this filter media is so intense it was awarded a patent (6,811,588), the only media in it's class to get one. AFE claims a 99.7% filtration rate for microscopic particles and 100% for boulders larger than 5 inches.

The multilayer construction of the Pro-Guard 7 allows for unlimited reuse. All it needs a vigorous wash, some oil, and another 45,000 miles of use.

The rigid construction of tough polyurethane and outer metal filter allows for high boost levels without collapsing any important bits into your intake.

To sum things up:

- 7 layers of filtering goodness

- 99.7% filtration rate

- Tough construction ensures no ugly collapsing under boost