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      11-29-2017, 09:23 PM   #517
Stev_chu
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Drives: 2015 BMW X5
Join Date: Oct 2017
Location: NEW YORK

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Quote:
Originally Posted by retx View Post
Quote:
Originally Posted by Kr0m3assass1n View Post
Anybody notice just one exhaust tip covered in black soot while the other tip is shiny? This is for a 2015 35i.

I also noticed on cold days that the same exhaust pipe is the only one billowing fumes. It's like only half my exhaust is working? :
The second exhaust won't open until the certain RPM is reached. I forgot what RPM, though. 3k+ or 4k+ RPM?

I don't recall that the cold start would have the second exhaust opened.

Anyway, my '15 35i produced the very deep and nice sound in the cold start, probably 5-15 seconds, but I didn't pay attention if the second exhaust was opened at the time. Or, the sound was due to the flap opening in the first exhaust.
Just the left tailpipe
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