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They're pretty much the same thing. It's bad because you're boosting the wrong side of the piston. Too much of it causes leaks and in some cases seals to dislodge.
Just looked at my valve. plastic body, metal innards.
Part number E301-13-890A.
Its body has the markings "E301A 0D21"
I still dont understand how they can break, all it is is a plunger that gets forced down when pressure is applied to one end. Its so simple what could break.
I went to the dealer and they said that the shop down the road is my best bet, they sell AC Delco parts and they are better then the oem parts... plastc outside metal innards... any feedback on that opinion?
^ I got mine from the dealer using a part number I got here referencing the old 323GTX, I am curious to know if the valve people are getting has a shiny metal body.