I am not about to get into a pissing match about a set of air filters. I was asked to see if these filters were as good as the little K&N's which go under the bearclaw. This is because many folk wish to retain the bearclaw. I tuned a bike with exhaust and RU1770 filters( which are much better than 2780s), then fitted the Ramair as a comparison. I checked the tune of the bike and it did lose average of 2 ftlbs and 1-2 hp across the range. To me that was a very GOOD result. The Ramair filter is better then the little K&N's and fits under the bearclaw well. A week or two later I had a customer with a classic with Jardines of the day on it. I fitted some street cams to it and a Ramair filter and tuned the bike. I have done quite a number of these bikes with Jars and K&Ns or Unifilters, under the claw, and never gone over 169hp with that combo of parts, so to get at least 3 hp MORE while still retaining the bearclaw, that again is a good result. The exhaust is what holds back the numbers in that combo. I am sure it is not the most high performance filter on the market, but I believe it is absolutely up to what it was designed for/to do. I made the effort to do this partly for you guys here and partly because the Ramair guys sent me one to test. So it is tested. Merry Christmas to all, have a safe one.