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I have the full sport system installed (mid pipe and muffler) and indeed the sound is deeper. When I start the car in the morning the house starts shaking :-)
I only have it installed for abour 500 miles, it is still getting louder. It seems to get louder up to 3'500 miles. While cruising it is quieter then stock, at least at the moment. This is because the drone is gone! I am happy with it, for sure.
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