4150 Drop Base Air Cleaner Black w/3 Red Washable Gauze Filter 16 X 3 Black Drop-Base Air Cleaner for 4150 Series Carburetors with 5-1/8 Diameter Neck HolleyHolley is proud to offer another breath of fresh air with our new 16 inch drop base 4150 air cleaner assemblies and filters. Available in 3 inch, 4 inch or 6 inch filter heights and in chrome or Edp black. The assemblies are available with a red washable gauze element or a white pleated paper element to offer the look you have in mind. The tops are so large and smooth we decided to leave them plain for a nice stealth look, or to use as a canvas for