The only concern that I have about the lawnmower filter is the reduced air flow due to its more air-restrictive design compared to the original more free-flowing copper design. If you look at more modern 6 cylinder engines that came stock with modern filters, you will see that they are much larger to account for the more restrictive material in modern filters. Then if you consider how much more restrictive the lawnmower filter will become as it progressively becomes dirty between changes, it comes to question whether it is the best choice for an air filter on these engines. $0.02
Carl
