I don't know how things work with Porsche, but I went through this with my Mazda. The dealer said they outsource installation, but provide the OEM glass.
I ended up going through Safelite, and they installed an aftermarket windshield. I immediately noticed optical distortion around the edges of the windshield, and more road noise. Plus they used their own rubber seals, so the windshield surround doesn't look factory.
I'd go 100% OEM on the Porsche.
-james
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'01 Boxster S, 51k miles
'05 Mazda 6 Grand Touring Wagon
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