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Old 09-08-2013, 08:12 AM
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Join Date: Dec 2011
Location: Niagara Falls, Canada
Age: 42
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Vehicle: 2007 Dodge Ram
Trim Level: SLT Sport
Color: silver
Engine: 2003-2008 345ci (5.7L) Hemi V8 345hp 375lb/ft
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The inlet to the muffler is 3" and the outlet is 3", if you are keeping it stock and just replacing the muffler you need 3"SI/3"SO. Now if you buy a muffler that can be reversed, you can cut out your Y pipe and run 2.25"DI/3"SO, that will eliminate the restrictive Y and run the mid pipes straight to the muffler so the muffler becomes the Y pipe. I you want loud and cheap, I removed the muffler and ran just the rear resonator on my 07 for a short while, it sounded pretty good but was quite loud.
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