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      12-29-2012, 03:15 PM   #6
Tiago@VRSF
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Drives: E92 335i, F30 328i, F82 M4, i8
Join Date: Dec 2007
Location: Hudson, MA

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The noise you're hearing is from the front of the car, not the rear

The OEM downpipes are double wall insulated and the OEM cat is very good sound insulator.