Marlin,
(me giving you advice?)
I would monitor the a/f ratio: 1) on a dyno; or 2) under load on the road; or 3)do an old-fashioned plug check
What ever you trust. if the plugs look good or the dyno monitor says 14 to 1 you are good to go.
I know my supercharged tacoma ALWAYS has a black sooty exhaust but the dyno showed a good a/f ratio, it runs strong and I can get 26mpg on a trip so I ignore the tailpipe.
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