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If you're looking for a deeper rumble, the downpipe will not give you that result as least imo. I just had my downpipe installed yesterday and it gave the car a slight rasp to it with about 30% louder exhaust sound. Might be different for you though since I am on stock muffler and Dinan midpipe (also b58 engine).
Hopefully others can agree or disagree with me to give you more feedback
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