Is the back window on the US 997.1 GT3 RS polycarbonate (plastic) or thin glass?

 

Glass.

 

In the US it is glass, but I believe it was an option for euro models. Maybe even standard..? But I am positive the US models is glass. Suncoast has the plexiglass version though.

http://www.e-partssales.com/miva/merchant.mvc?Screen=PROD&Store_Code=P&Product_Code =RSGlass&Category_Code=997gt3ext

 

Standard glass US, standard plexiglass in Europe. ( Also Europe gets no-charge roll cage, CF seats, and a few other things.)