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      05-01-2017, 06:59 PM   #18
apexlocator
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Drives: 2014 M5
Join Date: Feb 2016
Location: socal

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Those look like helmholtz resonators employed by some aftermarket exhaust systems. I see them mostly in the JDM market...
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2014 "AW/SO"me M5
Mission Performance/3.5 Bar
RK Autowerks/ CSF ICs
SSP Spec-R
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