The standard cover gets tumbled and then goes back in the mill to get the flame treatment. If you are asking why these are so much more than the other cover designs, the flame machining op takes 40 minutes per cover. 

A classic look with the fat trimmed off. These fit nice and tight to your carb and keep the out the gunk. Machined aluminum plates sandwich perforated stainless cages and foam to form the filter. Offered for a wide range of carburetors.

• Length: 6.00 inches
• Height: 4.00 inches
• Depth: 1.50 inches
• Body Material: 6061 Aluminum
• Filter Element: High-flow, washable, Uni Filter foam. Stainless inner/outer cages
• Hardware: Stainless steel screws
• Origin: 100% machined and assembled in house in San Diego, CA

OFF-ROAD / SHOW USE ONLY: Products are intended for off-road, racing, competition, show, or exhibition use unless otherwise stated. Products are not represented as DOT approved or street legal. Buyer is responsible for determining legality, compatibility, proper installation, and safe use. Please see full terms and conditions for more detail.