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This is the first time I've heard of the transparent roof panel being referred to as "sunroof".
I clicked on this thread out of curiosity about this "sunroof".
I had the same issue though with my T-Tops on my 1995 TA when I lived in Miami. I bought it with inserts that helped with the heat. Alternatively, you could always just stow the roof in the trunk and don't stop!
I ran the transparent roof for almost 6 yrs on my C6 (while living in central FL) with no heat issues using these headliners. I currently have the one from RPI and now live in central TX where the summers are in triple digits. Again, no heat issues...