Quote:
Originally Posted by 911monty
My 98 "breathes" exactly as yours does. At first I was concerned until I realized what is happening. With throttle closed and max vacuum in intake plenums, everything is drawn together. When the throttle is opened intake manifold vacuum drops and the intake manifolds relax appearing to expand. I may be wrong.
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Oh, yes, that totally makes sense.
These plenums are pretty well made that they withstand so many expansions in so many years.