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      11-03-2011, 08:38 PM   #62
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Drives: Space Gray e92 M3
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Originally Posted by Malekreza11 View Post
This is highly incorrect and provable Sean.
So let me ask you this. How much of a difference would there be between a OEM x-pipe which has primary cats swapped out for test pipes? And say another 'quality' x pipe? Performance wise that is...

Because honestly I want to to do that..keeping the secondary cats and resonators as to lessen sound and smell.. but at the same time gaining power.
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