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      09-06-2012, 06:14 PM   #2
Smiley1175's Avatar
Drives: 1M
Join Date: Jun 2011
Location: Melbourne

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I'm not sure if I fully understand your question but every aftermarket mid pipe I've seen is same diameter and bolts straight on to oe exhaust. The changes are usually the removal of the cats and/or the resonator. Not a change in diameter.
Hope this helps.
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