Maxx,
THe valve located at the intake manifold as explained by whatdamn is an EGR.
THere is no pipe that you mentioned, the head has a small port which allow exhaust to be recirculated into the intake. It is there for emission control purpose.
GT,
235whp, Garett T28.
Deacon,
65mm overbore MIVEC T/B done by a machine shop using lathe and fabricating a new 65mm throttle flap.
Oh, by the way anybody looking for GSR intake?
I've got one stashed away in my inventory.
Mine has mod with 3 auxiliarry brass fittings for bov, boost meter, boost controller, etc. or watever that needs intake manifold signal.