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If you have a catalytic converter and need all the emissions crap working to pass emission testing and register your car you may as well leave it.
It is blocking vacuum retard for the first couple minutes after a cold start so the idle is a little higher and the motor will actually run and make maybe 30-40 horsepower below 2000 rpm while getting off the line after a cold start with all the other prehistoric emissions crap they put on 30 years ago.
If you don't need all that junk to pass emissions get it out of the blue vacuum retard line and get rid of the thermovalve hidden under the air flow meter in the red vacuum advance line. The motor will run better.
You can use that little peirburg change over valve for other things that are good for performance like blocking the boost signal to the control pressure regulator below 4600 rpms with an rpm switch so the motor doesn't go pig rich when boost comes on at 3300 rpms.
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