Were the M110 engine Exhaust Manifolds a bare casting or did they have a finish applied from the factory? I seem to recall seeing a gold finish on a low mileage car, but not sure. If there was a colored finish, I was thinking of having a pair powder coated to match original finish appearance

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80 280TE, 5 speed
83 280TE- 5 spd, 16.5mm rear sway
85 280SL- 15" Bundts