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klerk · 04-15-2014, 10:00 PM

this is PN 18307645938. should be the same as on a sport package equipped 428i. there are some mods you can try with the OEM muffler (which this is) if you search.

04-15-2014, 10:00 PM	#7
klerk Private First Class 38 Rep 198 Posts Drives: 2014 F32 Join Date: Oct 2009 Location: austin iTrader: (0)	this is PN 18307645938. should be the same as on a sport package equipped 428i. there are some mods you can try with the OEM muffler (which this is) if you search.
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