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That ground point is next the to shock tower. If you ever drive in rain, or through a puddle, the water can get in the trunk. That is part of the reason for the black thick goo Porsche applied when the car was made.
Just humidity will cause that bare metal to oxidize (rust) so I would suggest a light coat of clear coat from a rattle can over the connection once everything is clean, and tightened down.
It is physically impossible to have too good of a ground. More is always better.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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