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      01-25-2013, 12:30 PM   #7
sean10mm
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Drives: '13 335i xDrive 6MT ZDH
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Turbos can benefit from a higher flow exhaust, but the main restriction is from the cat in the downpipe. You need a higher flow exhaust all the way from the turbo to see any substantive power gain, and you need a tune to really get the full advantage of it.