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This would matter more if we were on the c6 z06 section, at 4300lbs or so i think you can get away with the sunroof.
The double-panel sunroofs on the Cad CTS-V2 from '09 & up has it's own closet gremlins & demons to play with.
Mine is a solid roof also, and I don't regret it 1 bit. In 5 turbo Buicks all have been solid roofs too.