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      11-20-2012, 02:14 PM   #8
ms372
White Shark
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Drives: AW E92 m3 6MT
Join Date: Mar 2012
Location: Montreal

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i have the challenge sport and both are great you will get the same feel from both actually. but as dave said challenge will give you rasp depending on the muffler. well whenever you delete the primary cats you will get rasp with the stock muffler.