The back plate of this filter is CNC machined in cold forged aluminium for maximum strength,
The open filter cover offers a typical Rough Crafts design,
a minimum weight and maximum suction capacity,
The filter element is made in USA and made of a special synthetic material that offers better resistance all water; does not require lubrication but solo cleaning,
Compatible with standard and high-performance engines,
Note: The vent design is the patented design of Arlen Ness for the Big Sucker,
Vents are equipped with o-ring to the heads,
Oil vapors pass through the support plate and are conveyed all the inside of the throttle body mouth. this allows a perfect suction action and effectively eliminates all external vent pipes for maximum clean appearance.