Sorry for the delayed reply guys and thanks for the input. I'm running an AA rear and dinan mid. EssVt600. The exhaust is solid, no excessive in car vibrations, it is as loud as you would expect...
I don't have a code reader, the error message is right (and now left) tail light malfunction. As I mentioned, it happened the first time on the dyno (after I had had the current set up for a while) I assumed the small closed space, which amplified the exhaust note significantly, increased the vibrations as well causing the problem.
I guess in reality, I don't really KNOW that these things are releated. Just seemed logical. Anyway, any other thoughts are appreciated.