My 180's are ceramic coated (inside and out) and haven't damaged my engine bay/deck paint.
They do have negatives for working on the engine though. For example, they must be unbolted to get the valve covers off (Precision Proformance headers). You can't get near the engine until they cool down or you'll get some ugly burns on your hands and forearms.
Changing plugs takes about an hour instead of 20minutes. Wires have to be properly routed or they'll burn up.
Will
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