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Soot on the tips is very common. I've had to clean my tips since I changed the stock exhaust to magnaflows. This car does run a bit more rich than what we normally see.
If you have an android phone you can monitor your fuel trims with a very useful apparently called Torque and by purchasing an OBDII Bluetooth adapter. I use it for that among other uses and my fuel trims look to be fine. Total cost about $30. Pm me for details.
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2016 Camaro 1SS - 8-speed - NPP - Black bowties
2010 Camaro 1LT V6 (Sold. I will miss her!)
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