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      11-25-2014, 03:46 PM   #6
Kgolf31
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Drives: 2007 Z4MC, 2012 128i
Join Date: Sep 2008
Location: Ohio

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Quote:
Originally Posted by Covo_M View Post
It makes a weird sound after a few minutes than they both open up.
Cool, you're all good.

The weird sound is just from the engine cold starting. The engine runs at increased RPMs to warm up the cats to make it more efficient.

Perfectly normal operation (and cold start happens on all cars)

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