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I've met a guy that built a J test pipe to a Z4M with RPi. He said it reduces the idling decibel from almost 100 to 88dB. The volume of the sound and tone stays the same but drone is minimized next to none.
Since he loved the RPi sound the best, out of all the other exhaust for the Z4M but can't bear with the drone, this is his solution with good results.
thoughts?
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