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'55 Chevy 3800 Cummins
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03-15-2021, 07:02 AM
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xj_man_646
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Join Date: Oct 2004
Location: MN
Posts: 27,529
Matt, I suggest 4" exhaust. There is no reason to struggle to package a full 5" turbo back system. You won't have the power to use that much flow.
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