Two days ago i was drivnig up my street and within 5 seconds a really loud sound came from the exhaust. It sounded like it came from the turbo or exhaust manifold. Sure enough there was a half inch hole in the exhaust manifold. I believe it was put there by the factory because it had a smooth surface like something was pressed in. When I took the turbo and the manifold apart a piece fell out. What I think it is, is a device to reduce turbo lag by closing one of the two holes kind of like a simpler version of the newer variable venturi valves. I may be wrong, but that seems like a logical explanation for what it does. Does any one know exactly what it is? Where can i get a new one?



Thanks



Rob



1986 GXL w/

1987 J-spec TII

Are you sure it isn't part of your waste gate? Meaning the metal peice that opens and closes to keep boost pressure constant. If you have a FSM check the engine section and look at the turbo diagram and see if you can locate the part.

yea, it could be part of that turbo lag reducer thing the factory turbo is set up with, part of that twin scroll exhaust design they had