The membrane is the plastic sheeting that keeps the rain out of the interior of the car as it washes down the window. I say it is worth it unless you want to do it yourself. I have done many different marques window regulators, they are all pretty much the same, not difficult just nerve racking if you have not done it before.
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2001 Boxster S 3.6L, Zeintop
"Calling upon my years of experience, I froze at the controls." - Stirling Moss
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