Hello, My name is Duane Service a lurker from Port Charlotte Florida.  In following  the thread about air filters, I feel constrained to point out that Amsoil, the synthetic oil company has rexcently  developed an air filter that has vertually no drag, and very high effency in cleaning the air.(They more recently introduced  an oil filter with the sme properties.  Anyone interested contact me, or look at the company website, www.amsoil,com <http://www.amsoil,com>, and look at filters.  This company has led in the development of synthetic oil products, and after using these products for over 25 years have found that they have only been consertative in their claims, and their r and d have greatly impacted all the lubrication industry.