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Old 04-06-2019, 11:10 AM
ctorrey ctorrey is offline
Location: Boston
Join Date: Mar 2007
Posts: 1,479
Mein Auto: 2017 BMW 340xi M-Sport
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.

2017 340i xDrive | Mineral Gray | Coral Red Dakota | M-Sport | M Performance Power & Sound | ZCW | ZDA | ZLP | 2PE | 2VF| ZTP | 5DL | 5DP | 6CP
2017 X3 2.8 xDrive | Deep Sea Blue | Saddle Brown Dakota | ZXD | ZW2 | ZDA | ZLP | ZP3 | ZTP | 5DL

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