Thread: Inside Performance - Quad Exhaust Muffler
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      08-11-2009, 11:57 PM   #7
BI2016
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Drives: 2010 xdrive 40d, 2012 135i dct
Join Date: Jan 2008
Location: Australia

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Yep unfortunately these systems are costly... even more reason to be wary.

I do agree that they should mention how unsuitable it is for the 135i.

Robert in Summary the Hartge system actually works
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