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      07-01-2014, 09:28 AM   #5
Chili Palmer
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Drives: 2015 650i Gran Coupe
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Quote:
Originally Posted by twelve535i
If you modify your muffler to resemble the m5 mufflers, be aware that chamber 1 on the M5 mufflers most likely use perforated tubing, so sound can be directly absorbed by the fiberglass packing.

It will probably sound great. Maybe a little less drone that M5 muffers, since 550 mufflers are huge
If you look at the pics in the original post you'll see that the black perforated section of the muffler is actually a larger area than the M5 muffler - to get the right sound you might need to experiment after cutting the loops in the back section with trying the front section without fiberglass packing and with or maybe even see how different grades of steel wool will do in tuning the sound.
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