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What does it mean when inside exhaust has white residue? Lean or just the fuel I’m using cause it? I use Sunoco 116 maximal.
 

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Maximal does it. I have same in my exhaust. But you should still be checking plugs or A/F to be safe.
 

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When I used to run my car on a chassis dyno, the pipes would be white inside after the end of the run. The infra-red said I could've added more fuel but for up to a 30 second blast, it was fine.
 

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Can't speak to the mzximal but Torco with nitrous used to leave a cigarette ash like deposit pretty similar to what you have except slightly gray.
 
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