R2C has broken the barrier between achieving extremely high filtration efficiency while keeping filter restriction as low as the leading low restriction air filters. R2C has tested nearly every filter configuration currently available. That includes the most common cotton gauze filters from many different manufacturers, as well as cellulose (paper), and the various blended and "nano-fiber" products.

What we found was that low restriction invariably resulted in low filtering efficiency and high efficiency came with high restriction. Dust holding capacity (the measurement that determines how fast filter restriction rises when in use) on none of the existing products were up to our standards.

 

Of course, our standards are pretty high. R2C's PowerFlow Performance Air Filter products were developed by the same people that designed and built many of the military's vehicles engine air intake systems and filters. The same obsessive attention to detail and engineering standards that has gone into those military products have been put into every PowerFlow filter you buy. You get the best-of-the-best when you use one of our products. The first thing to remember about an air filter is what it's designed for, and that's to protect your engine from damaging particulate. If it doesn't do that it shouldn't be on your vehicle ... no matter how low the restriction is.

Cotton gauze filters currently make up the majority of the low restriction air filters (see the section discussing cotton gauze products). When efficiency is addressed by these manufacturers, you usually find some qualifier with their claims such as "adequate for engine protection" and "meets manufacturers' requirements." There's a reason for those ambiguous statements ... cotton gauze filters aren't very efficient!