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      09-13-2013, 06:47 PM   #1
Hedward
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Drives: 2007 BMW M Roadster
Join Date: Dec 2010
Location: Pennsylvania

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Exhaust question

I'm planning on euro headers and DKF section 1 pipes with 300 cell cats; the rest of the system remaining stock.
Trying to get a general idea of the expected change in the noise level. Does anyone know the size of the primary and secondary cats on the NA version.
Thanks in advance.
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