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Old 03-07-2013, 02:32 PM
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HOTRODHARLEY HOTRODHARLEY is offline
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Join Date: Feb 2013
Location: EDMONTON, AB CANADA
Age: 32
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Vehicle: 2013 Ram factory order
Trim Level: ST
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Engine: 2009-20?? 345ci (5.7L) Hemi V8 390hp 407lb/ft
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Back pressure is a joke to us. We really don't need to be worried about back pressure. Pressure waves in our long systems make enough back pressure. Size it bigger always. 3" is a good decision for duals. and 3.5" or bigger for a single system.

Now a short system that dumps 2 feet after the header collectors will be lacking back pressure. But that's a different story....
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