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      07-19-2012, 11:01 AM   #7
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Location: Bayern, Germany

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Originally Posted by Zuzu View Post

And this thread too...

Yup, it seems to be a Chinese market thing. Seems that BMW AG put a different exhaust on Chinese market 1M's - and the inside pipes do not get much exhaust flow and hence stay clean! Btw... I noticed the same thing on the new F10 M5 when I sampled one recently.

You could order a non Chinese 1M exhaust or take your off and cut out the blockage.

I looked up the rear exhaust on

and low and behold... China DOES get a special different rear exhaust muffler! National China version...

China exhaust muffler #18107847100
EU/RoW spec muffler #18107845402

Name:  1M_rear_muffler.png
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The curious thing is how can the 1M muffler/can pass Swiss noise regs while not pass Chinese ones!?!?