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First drive in 328i. Getting a humm-howl from trunk when at highway speed. Sounds like the stock muffler resonating through empty trunk. The 16 Mich. Energy all weather tires may enhance noise at speed.

Dinan muffler won't affect warranty I hear. Maybe it is the fix it needs. Will muffler choice affect warranty? Already warned to keep the basket weave 16s on for odometer reading. I laughed and said whatever, those rims and donut tires cheapen a nice highline German auto, this ain't a Civic Mr !

Are noisy rear 328i common ? Has 40k miles on 2000.
Sounds like front shock making lould thug on speedbumps and steep drives, warranty work there too.
 

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Mine is TOO quite, everyday im tempted to punch a hole in it! Theres gotta be a loose screw or a different problem not relating your exhaust.
 
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