This cone-shaped air filter from K&N is designed to work in the Tiga Sports 2000 racecar air scoop, but it can be adapted to a wide variety of custom applications. The large inlet end is flexible enough to conform to an oval or rounded rectangle. The small end has a hole to allow debris to pass through the scoop.
Inlet: 5.5" Outside Diameter / 17.25" Circumference
Small End: 2" Outside Diameter
Effective Filtering Area: 190 square inches (enough for a 396 CID V8 revving to 10,000 rpm!)