sorry i know this is a noob question but what is iab? is it important and where is it located?

 

those are you secondaries located on the side of the manifold. also know as the butterflies.

 

IAB is another acronym for the secondary butterflies in your intake manifold on the gsr engine...its more of a system then a single thing, but it does have a vacuum box on the underside of the manifold that gets a signal from the ecu to open the butterflies at 5700 rpm

 

damn you guys know your **** thanks a lot!