Stock intake vs performer?

fratzog lover said
How about the difference between the performer and performer RPM? I have the RPM because of having A/C.
Click to expand...

That's a Horse of a different color.

The Performer RPM {#7176} has a larger plenum than the Performer, and the
Runner Ports have a better design for higher lift Camshafts.

The Performer RPM is taller {+.72"} than the Performer, and the Port
Dimensions {1.01" x 2.17"} are larger as compared to {.97" x 1.95"}.

That is nearly {+16%} more air-flow thru the Runner-Ports.