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Exhaust 5.7 HEMI Exhaust Discussion

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Old 08-17-2011, 08:22 PM
rtdevita rtdevita is offline
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Default Flowmaster

I have an 07 quad cab. Wanted to install a Flowmaster 40 series muffler. Does anyone know the entrance and exit diameter of the stock muffler?
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Old 08-19-2011, 11:56 PM
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Mumauber Mumauber is offline
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I have an 06 Quad Cab with the 4.7 and mine is 3" I/O. I imagine yours is the same if you have the 4.7, since they're both 3rd Gen. I'm guessing though. My father in law has an 07 with the 5.7 and I think he told me his was a little bit bigger, but he could be wrong. When I started looking for my muffler kit, I just took a tape measure to the pipe.

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Old 08-20-2011, 06:10 PM
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Drake371 Drake371 is offline
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and the 08 4.7's are 3" as well... Also if you go to Flowmasters website you can "search" for products that fit your truck and it gives the I/O thats used.
Superchips Cortex, K&N CAI 63-1529, Sprayed in Bedliner, ARE cover, Flowmaster exhaust kit ... more to come
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