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u need to do cosmetic surgery just to get it to fit and even then it still wont work
All of the C6 heads are HEAVILY dependent on the serial data bus. I don't know C5's, but I have to believe that since there are major differences in the modules required to use an aftermarket head in a C5 vs a C6 that the data buses used in the 2 gens are quite different.
Besides, for what you'd pay for the C6 stock unit you could get a WAY better aftermarket head. I have factory NAV and if I had it to do over again, I wouldn't order it.