"These filters far out preformed the K&N and Napa filters we used in the past. Through on-track performance and oil sample test, the R2C filter is worth every dime."

“I would like to say thanks for making a filter that does what you claim. We run a DIRT northeast modified and I tell you what, it could not have been any dustier. We finished second 4-25-09 in part with your product. When Sunday morning rolled around, the first thing on the list was to see how well the filter worked. When removing the filters lid, it was hard to say what I was going to find. Where's the dust? Clean as a whistle. Thanks again for making a useful product available.”