1st Gear Member
Join Date: Jan 2005
Location: Clemson, South Carolina
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that vacuum pipe you are talking about is to open and close a a port on one of the exaust ports. the vacuum pipe is fitted on a raound thing, inside there is a round metal shaft that moves foward or backwards, to open or close the port on the exaust.
this pipe goes all the way back to the manifold, on stock exaust systems, when ever you step on the gas, vacuum is created on the manifold, but when accelerating there is a high vacuum moment, this high vacuum opens this port. this little port system was to ensure optional low end torque and top. so the engine can have a more controlled exaust system for different engine speeds.
sicne on the new exaust there is not such a device, all you have to do it to plug the pipe. and dont go to the guy who installed this complaining, because there is o nothing he can do.. yes he made a mistake of not plugin it. but still there is nothing he can do about the port opening and closing feature, only stock exaust system have this,
and if you went to your exaust and is not there, well there is an explanation. OBD 1 cars did not have this, since they where more primitive. beginning on 95/96 they had the OBD 2 system, a much advanced computer management system..
so dont freak out.. as long is plugged, your good.
and if you think this is not true, go and look for a metal "door" on one of the ports on the exaust of any e36 that is made after 95/96 .
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