John threw these up for me to show how these intakes differ when put side by side. Thought it would be beneficial to see. The shiny one is a Professional Products unit. Man, they are deep intake plenums compared to the others. They are all for the GM Vortec pattern. Ran (or am running) them all with the exception of the polished unit.
Did a comparison of a Pro Products Air Gap and a Edelbrock Victor Jr. Was what I expected, 460hp as compared to 480hp, with 17 numbers above 450 tq for the Pro Products and 15 numbers over 450tq for the Edelbrock, with the whole package with the Edelbrock at a higher RPM. Put the Pro Products on when the motor went in the car.