The stock muffler does a good job keeping drone away... The mufflerless setup I have has a drone reducing resonator, but not really sure if it does anything at all. i'd like to hear it straight piped vs the Active Autowerke and see if there is any difference. I had plans initially to remove that resonator piece and use that pipe to start the dual setup and tips on right side exit.
What is the part number of the Vibrant that you installed? Did you weld them in or are they slip on and clamped?
Here is a pic I have when we were fitting it up...
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