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      02-28-2012, 11:40 PM   #63
First Lieutenant

Drives: 2k11 335is
Join Date: Sep 2009
Location: USA

Posts: 397
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Yes after 20 seconds or so

The valve will kick in and RPMs will drop and then it gets quieter.

Originally Posted by bavarian19 View Post
I thought it was the opposite. I thought the valve was closed during startup to allow the cats to heat up faster.