Thread: FS: Challenge Resonators
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      12-10-2012, 01:04 PM   #3
C ///M
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Drives: '04 M3 & '07 X3 M-Sport
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Sorry I'm not that familiar with the e9x M3 exhaust specs, but what is the inlet/outlet size for these? 2.5"? Also, I assume they are a straight flow-through design?

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