Forged billet aluminum backing plate features Big Sucker™ hidden breather technology and a radius air inlet for smooth airflowForged billet air filter covers feature exposed design and a CNC inverted top that acts as a velocity stack to help pull in more air flowHidden breathers are O-ringed at the heads and exits at throttle body/carb to create a virtually closed-loop systemPerformance filters features a black synthetic filter element wrapped in a stainless steel jacketBlack stainless steel jacketed inverted filters feature an inverted pleated top and 360° of pleated sides to pull in filtered air from every angleCNC-machined from forged billet aluminumNo external hoses or hardware neededMade in the USA