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The one you most recently posted seems to be really clean even though its green(RJP) and not black. What concerns me is the driver side headlight. It was either in a front end collision or that headlight specifically was faulty. maybe moisture?
If you look really closely you can see that both headlights are modified.
On the question of undleaded fuel, you can run 87 octane on a base motor, but as soon as you turbo it, switch to premium. When you up the performance, boost or more aggressive tune you require a higher octane to keep from detonation.