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      09-06-2012, 04:17 PM   #1
E30 Racer
Second Lieutenant

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Drives: '11 1M, '99 540i/6, '89 325is
Join Date: Aug 2011
Location: Ohio

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Aftermarket midpipe to OE catback question

Presumably, the post-merge aftermarket pipe diameter is larger than that used by BMW. How does this affect the ability to join them without replacing the coupler on the catback side?