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      09-23-2012, 06:14 PM   #5
flinchy
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Drives: 130i
Join Date: Nov 2011
Location: QLD, Australia

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Quote:
Originally Posted by monkey_wrench
I think that's for the 330i only, the 330i and 335 have vacuum operated a valve on the muffler.

Not sure what it does, but by plugging it you'd be doing the "golf tee mod"
Makes it quiet on startup, warms up faster