I have a PI Intake! maybe?

How do I check to see if the intake manifold on my car is a PI? I have a '96 and I know they come without the PI stuff but the guy I bought the Intake from said it had a ford performance intake manifold on it. What is the number for the manifold and where is the number located at? Also what gains would you see from the PI intake manifold swap? I did a search and someone said 20 hp but I am questioning that. Any info is appreciated. Thanks!
Josh

OH my bad I miss typed and didn't proof read but I meant to say "the guy I bought the car from said he added a ford performance intake." Thats what I meant to say. The intake is already on the car. The code on the manifold is SAE-9424CA M738E. I am going to do a search now to see if I can find anything more out. Thanks though!
-Josh-