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      04-24-2013, 07:59 AM   #4
Ale J
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Italy
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Drives: Z4M Coupè
Join Date: Apr 2013
Location: ITALY

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I was amazed too, but we put the car on the bench before and after, and the result was that, even with an improvement of the torque. The original mufflers are very strangled while on these system have been studied in order to have the best pressure...
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