Spectre Cowl Induction Air Cleaners are a universal open top airbox designed for carburetor and throttle body injection assemblies with a 5-1/8 inch neck. Designed to seal to the underside of the hood or the underside of the hood and firewall. These air cleaners help improve performance by isolating the filter while drawing cool outside air from the base of the windshield. They include top, base, and a HPR or Xtraflow air filter (Xtraflow brings in even more air than HPR). These reusable filters help create extra horsepower and quicker acceleration by flowing more air into the engine than regular paper filters. /p>