hi there, so I was wondering what you all think about my situation. So I got my LT headers installed and got a tune done from a local shop in Hawaii. After he did the install my exhaust tips turn gold and on cold start up it blows black smoke and upon acceleration i can see faint smoke come out of the exhaust. Any ideas? Maybe a bad tune? Thank you!

Yes, sound like the tune... The air/fuel ratio is too rich, which typically produces more soot and can discolor the tips.