The CA-2300 is basically a product to help the 4 cylinder performance customers with their engines. The EFI lower intake is far superior to the regular carburetored intake.
N O B L E N D I N G R E Q U I R E D
The CA-2300 has fins on the inside to direct the airflow from the Holley 500 to the 4 holes in the lower portion of the EFI manifold. Others supply a spacer, but the 2” tall spacer from PME really puts a boost in your power and performance. See picture below for complete kit.