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      09-25-2015, 11:28 PM   #65
pbonsalb
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Drives: 18 F90 M5, 99 E36 M3 Turbo
Join Date: Feb 2011
Location: New England

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Certainly aftermarket headers will weigh more than stock. As for the x-pipe, you have to consider whether there were cats or no cats or resonators. ARH is not denying what it previously said. I suspect that if we checked stock versus other after market x-pipes similarly configured there would be little difference.
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