This cone air filter has a 4 7/8" diameter opening which can be easily deformed into an oval or rounded rectangle to fit a variety of air inlet scoops. The small end has a drain opening to allow small debris and water to escape. Fits the standard intake scoop on Ralt FA / Super Vee and Zetec-engined Van Diemen F2000 cars (does not fit the cowl intake on Pinto-engined Van Diemen FC).
Inlet: 4.87" Outside Diameter / 15.3" Circumference
Small End: 2" Outside Diameter
Effective Filtering Area: 173 square inches (enough for a 350 V8 revving to 10,000 rpm!)