My SS always has a crapload of carbon resin on the tip of the muffler just because they all run rich. If that doesn't solve your problem, then you may have to take it in to a shop that can diagnose the codes.
About the wing, that was not easy to take off at all. You have to start by removing the bolts on the inside of the trunk. Tape around the base of the spoiler with blue 3m masking tape so you dont scratch it upon removal. Get plastic wedges and use them to evenly remove the spoiler from the double sided glue. Once the spoiler is off, you can use goo gone or a rubber buffing wheel to remove and polish. Then you have to find body plugs or fabricate your own just like I did or you will have holes in the trunk.
Any questions about the Balt, all answered here:
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