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      11-08-2011, 12:41 PM   #16
GTHAUS
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Drives: F10 M5, F30 335i
Join Date: Jun 2011
Location: Chicago

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Quote:
Originally Posted by 1M Fan View Post
It looks like the factory muffler and resonator go away and it gets a mid mount muffler only. It looks good. Does it leave all the cats in place for the 10 - 15 HP gain?
Yes, our cats are still in place and were not removed.
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