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Old 04-06-2019, 11:10 AM
ctorrey ctorrey is offline
Porleau
Location: Boston
 
Join Date: Mar 2007
Posts: 1,479
Mein Auto: 2017 BMW 340xi M-Sport
Quote:
Originally Posted by ship4u View Post
Thanks. I drove a 2015 M3 that was pretty loud on start up and then toned down after it warmed up. Is it similar? I don't recall the M3 burbling and popping as I've heard on videos of the M Performance exhaust.
On initial startup, all BMWs rev a little higher and the exhaust flaps are open. This is to heat up the catalytic converters. After 20secs or so the exhaust flaps close and revs come down.
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2017 340i xDrive | Mineral Gray | Coral Red Dakota | M-Sport | M Performance Power & Sound | ZCW | ZDA | ZLP | 2PE | 2VF| ZTP | 5DL | 5DP | 6CP
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