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      05-17-2019, 04:43 PM   #7
Billfitz
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Drives: '15 328iX GT
Join Date: Jan 2015
Location: New Hampshire

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The original pipe is wrapped with foam insulation. I don't know if it's supposed to keep the air in the pipe insulated from the heat of the engine compartment or the other way around, but I figured if BMW had a good reason to use it I would too.