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X3 F25 (2011 - 2017)
The second generation X3 added style and new features to the BMW's mid-sized SUV. Talk about the BMW F25 X3 with other X3 owners now!

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Old 01-03-2013, 03:56 PM
fclohden fclohden is offline
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Location: oakland California
Join Date: Jul 2012
Posts: 2
Mein Auto: 2011 M3

Iwant to change the exhaust to an after market on my 2013 X3 35i. However, does anyone know the "real" reason for the vacuum operated valve in the current exhaust.
If it's for back pressure for the turbo or some other reason I don't want the affect the warranty by changing the exhaust..
Thanks in advance...
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Old 01-03-2013, 05:12 PM
Roundel-NY Roundel-NY is offline
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Location: New York
Join Date: Nov 2012
Posts: 24
Mein Auto: 2013 X3
Backpressure. Don't know if you will gain anything by going with an aftermarket muffler. Maybe a slightly different exhaust tone. Won't be any noticeable power gain. Some have unplugged the vacuum hose and made the butterfly valve open at all times. You can try that, see if you like the results.
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