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Old 04-05-2019, 10:21 AM
ship4u ship4u is offline
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Location: Wits' End, Ohio
Join Date: Oct 2018
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Mein Auto: 2016 435i RWD Convertible
Originally Posted by ctorrey View Post
I have a '17 340xi with port installed M Performance Power & Sound Kit. I don't believe there is any power gains with the exhaust alone (obviously the 'Power' part of the kit gets you another ~35hp/39tq). Anyway, I have found that in 'Comfort' mode the exhaust is just a little more throaty than stock. When in 'Sport' mode, you get the burbles and popping on overrun conditions. It's also significantly more throaty. In no way is it as raucous as modern muscle cars (e.g., high performance Mustangs and Camaros), but it does add a little more personality to the typically sedate B58 engine and exhaust.

I believe the experience you would have with the N55 engine is similar. If it were my money, I would go with the MPPK kit for the N55 which gives you some actual performance gains. I had this in my previous '14 335xi and you do get some of the burbles and pops in Sport mode - even without the M Performance exhaust.
Thanks for your comments! So, do you think that I would not wake up my neighbors in Comfort mode? I'm new to this, how would I know if an MPPK kit has already been installed?

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2016 435i Individual - Citrin Black / Nutmeg Extended Merino Leather
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