whats up guys, gotta quick ques.-
whats a plenum? and what does it mean when its ported??
thanks in advance!

 

In our situation (cars) pop your hood since you have TPI. See the long, squarish thing in between the tubes (runners) that go to the intake base? that's your plenum. It "holds" air and divides it to each cylinder through the runners.

When you "port it" you open up and smooth the transition points in it (at the runners and Throttle Body) to allow for more air to pass, and with less friction.

 

makes sense, thanks mike