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Old 03-21-2018, 04:54 PM   #3
jleonard
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Join Date: Jun 2008
Posts: 5,037
When I owned a 1991 Dodge/Cummins pickup, I changed the exhaust from 3 inch to 4 inch.
It made a noticeable difference in power, and it set me up to make further "power enhancements".

A diesel does not like any restrictions to the exhaust flow.
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Jay Leonard
Ex boats: 1983 40 Albin trunk cabin, 1978 Mainship 34 Model 1
New Port Richey, Fl
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