This RC air filter has been winning races all over the world for five years. RC racers like it for its very fine dirt stopping power.  After a full weekend running, this RC air filter passes the Q-tip test (run a Q-tip around the inside of the carb) with not a speck of dirt entering the engine. 

Motor Saver had phone conversation with Steve Canadian, highly respected on-road 1/8 scale two wheel and four wheel drive RC racer:

"I have been using foam filters on my engines for a long time.  I had always gotten some scoring of the piston and sleeve and thought it was normal.  I started using Motor Saver Air Filters on some of my engines about two years ago.  After inspecting the engines I found the scoring of the piston and sleeve had gone away.  This is obviously good for engine life and can relate to other things...to improve racing".