Aeroflow Performance cast carburettor hats are the perfect solution for any blow through installation. These EFI carburettor hats have a contoured designed which promotes optimal airflow. While also providing excellent hood clearance of 100mm to suit a 5-1/8" (4150) air cleaner flange. These hats feature a 1/8" NPT reference port on the back of the hat that can be used as a convenient hook-up for boost reference for carburetted fuel pressure regulators. The inlet is designed to suit a 3.5" silicone coupler on the front, with a sealing lip to ensure a leak free installation. The 1/4" air cleaner stud is included as well as our 5/16" to 1/4" air cleaner stud adapter. Air cleaner gasket, stud, washer, nut and 1/8" NPT plug is included.