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      06-17-2019, 04:27 PM   #1
Kheadley
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135I Exhaust diameter

What is the diameter of the muffler pipe? Before the dual tips on the n55 single muffler.
Is it the same size as the n52 (328xi) pipe?
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      06-20-2019, 05:21 AM   #2
katsooba
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It is a 2.75" pipe

U can see if it is the same size by comparing the seal rings of the muffler and the midpipe on realoem.
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      06-25-2019, 08:42 AM   #3
houtan
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2011 135i  [5.00]
Here are my measurements when I cut the pipe for the bmw pe y pipe. Its actually ridiculously small which is why I went to a dual 2.25 to single 3.5 y pipe to muffler exhaust.
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