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      10-04-2012, 12:49 PM   #6
GTM_Challenge
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Drives: E92 M3,X5M,F30 335
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The Akrapovic x pipe cannot be used unless you have a special conversion part a few others made. The Akrapovic uses a slip fit design so it doesnt have the typical ball shape that the oem one does.

Most of the Eisenmann exhaust guys use the Challenge X pipe. The Dinan one has also been popular, but a but more pricey.