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      01-19-2013, 01:36 PM   #5
M54ccibo
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Drives: '13 F10 M5 AW/SO
Join Date: Apr 2012
Location: Orange County, CA

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Valve after the downpipes? If that's the case on the F10 M5 you'll still have the cats (emissions) as they are in the downpipes, unless you gut them

Still, wondering about the sound and any HP increase.
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