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08-10-2015, 04:44 PM
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Registered User
Join Date: Sep 2014
Location: Johnson City TN
Posts: 311
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Factory exhaust size? 1971
I'm in the market to replace the muffler on my 71 GMC and I'm wondering what size the inlet needs to be to hookup with the factory piping. Its currently pouring the rain here so I can't get outside to do any measuring. Its a small block truck if that makes any difference. Thanks to anyone who might be able to help me out.
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