Our Test Results
Dust capacity is just how much it'll handle before it collapses or chokes the engine off so it won't run well. It's important if you operate in dusty or dirty environments. With the dry element filters, the capacity on the bench is less, but one whack or bump and a lot of the dust falls off of it. When is the last time you were wheeling your Jeep on a perfectly smooth road?
Efficiency ... the golden buzzword. While all the filters tested were very close, over time the impact on your engine can be huge. These numbers are for a relatively short test with a small amount of dust. Multiply it by 10 or 100 to get a rough estimate of how much dust makes it into your engine on a given wheeling trip. Seven grams of dirt is about a 1/4-ounce wheel weight. Do you want one of them in your engine?