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valve seals and spring locators and represents a drop-in installation for many popular LS applications
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These are the countersunk head style bolts suited to the later model retaining plate that can be found here
57S-3300 K&N Performance Air Intake System, Alfa Romeo Mito/Fiat/Abarth Punto 1.4l, '07-20 beta valve seals and spring locatorsOVERVIEW The K&N 57S 3300 Performance Airbox replaces the restrictive factory air filter and air box. K&N performance air boxes are designed to dramatically reduce air flow restriction as well as smooth and straighten air flow. This allows your engine to inhale a larger amount of air than the factory air filter assembly. DETAILS Guaranteed to increase horsepower Designed to improve torque and acceleration Replaces entire factory air box and air filter