E92 m3 backboxes. - BMW M5 Forum and M6 Forums
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post #1 of 3 Old 25th July 2015, 08:39 PM Thread Starter
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E92 m3 backboxes.

What is the best backboxes exhaust in terms of sounds and price.

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post #2 of 3 Old 27th January 2017, 04:11 PM
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i went to a place in nj that just removed some of the sound deadending material and rerouted one of the pipes inside the muffler itself and it made an amazing difference.
was pretty cost effective too, $500
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