Thread: Exhaust mod in N55 E92 after DP
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      04-18-2014, 07:53 AM   #10
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Originally Posted by Sidewinderpb View Post
Yeah, BMW already nailed it with the catback. Upgrading will only provide a different tone to the exhaust - which is still awesome.

I also believe that the stock piping is already 2.5".
Yeah I measured it a while ago looked like 2.25" but you might be right.
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