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Old 01-09-2013, 06:56 AM
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exhaust

Hey yall, I have a 01 7.3 SD auto. I was wondering what are some good exhaust systems I should run on it have factory now with a muffler delete and with my re custom tunes I want lower egts and alittle more turbo... would a 3,4 in dp make a big difference on the 7.3?
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Old 01-09-2013, 11:30 AM
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4in straight is good enough flow up to about (I have been told) 450ish hp. 5in for anything more...If "emisions"/inspections then need a cat.
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Old 01-09-2013, 11:35 AM
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Get a 4" Turbo Back system from Diamond eye, or MBRP

They are the most common!
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