Received the AFE Pro Dry air filter for Christmas and so far Excellent! No whistle as others speak of. Drove down to Virginia from New York before Christmas and was disappointed with my average MPG'S (only about 18.3 mpg.) with mostly highway driving which I believe is because of the added ethanol. The last trip in August I averaged about 21 MPG. Installed the AFE PRO Dry filter, disconnected the battery for about 5 minutes to reset the computer and went out with the 4Runner. I am happy to say I now averaged 19.8 MPG over 75 miles with local and highway driving. I will see if the ride home will average more than the ride down with the new filter. Response may be a litter better but not really sure of that.:bluejump: