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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N20, N26, B46, B48 Turbo Engine / Drivetrain / Exhaust Modifications > Muffler packing material
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      07-05-2018, 07:23 PM   #1
hcw5
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I believe this might have been addressed in another post somewhere because I remember seeing it, but I can't seem to find it now, so if someone knows what I'm talking about feel free to point me in the right direction. Anyways, what I remember seeing was the inside of a 335 muffler that had been cut open. There was some sort of material on the inside of the muffler that I guess would dampen the sound a bit. Does removing the material cause the sound to increase at all? I have a 435 muffler already that I'm going to put on my 328 and figured I could have it cut open when the shop installs it.
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      07-05-2018, 08:21 PM   #2
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From what I've seen from YouTube videos, even the people that full straight pipe their exhausts keep the packing inside
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      07-05-2018, 10:09 PM   #3
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That material is probably fiberglass, and it only affects the higher frequencies. Lower frequencies are damped by the baffles in the muffler. This explains how:
https://auto.howstuffworks.com/muffler2.htm
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      07-05-2018, 10:43 PM   #4
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Quote:
Originally Posted by Billfitz View Post
That material is probably fiberglass, and it only affects the higher frequencies. Lower frequencies are damped by the baffles in the muffler. This explains how:
https://auto.howstuffworks.com/muffler2.htm
so a lack of fiberglass probably would not make a very noticeable difference?
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      07-06-2018, 05:04 AM   #5
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Have the shop take out 50% of the packing and weld a pipe around the perforation pipe inside the muffler. This is what gave the best sound on the e90 335s.
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      07-06-2018, 07:40 AM   #6
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Quote:
Originally Posted by hcw5 View Post
so a lack of fiberglass probably would not make a very noticeable difference?
Not the way you want it to, assuming you're looking for a deeper, more throaty sound. You get that with 'glasspacks', which have no baffles and are stuffed with more fiberglass than standard mufflers.
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