The PureOnes have about the highest advertised efficiency rating, a nice silicone ADBV, decent construction, and are reasonably priced compared to motorcycle-specific filters. Despite the fact that Purolator says not to, many of us are using them on our motorcycles. Apparently, Purolator wants us to buy their motorcycle filters, which are made in China, cost more, and are lower quality. You can get Pure Ones on amazon.com at a decent price, Pep Boys and Advance Auto and probably others stock them. The best filter that is available at WalMart is the Fram Extended Guard, which is not to be confused with their lesser offerings. The Wix or NAPA Golds would be good ones too. Most motorcycle filters that I have seen tend to be nothing special, except for the high price.