Thread: F30 335i N55 vs 328i N20 Sound Comparison Video: Track Flyby, Engine and Exhaust
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      02-28-2012, 10:40 PM   #64
KevinJ
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Drives: 2k11 335is
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Yes after 20 seconds or so
The valve will kick in and RPMs will drop and then it gets quieter.

Quote:
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.
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