4inch down pipe
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4 inch would be a real bear to put in, doesnt gain enough more than a 3 inch to be worth it, go 3 inch down pipe, (might still have to push back the firewall), and go to 4 inch after the down pipe and get rid of the converter and muffler. The converter is the biggest restriction in the exhaust on the obs powerstrokes.
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ebg2g
5.9 Liter CR Dodge Cummins 03-07
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03-29-2015 06:15 PM