Desert Shield/Storm Vet
Join Date: Dec 2006
Location: Munising, MI.
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to Powerstroke.org. Honestly I don't know the answer. I went with the 4 inch to let out as much exhaust gas as I can to keep the egt's down. I suppose it could even have the opposite effect by causing more restriction the 3.5 downpipe. I could be wrong though
2002 F-250 4x4 EC, SRW, SB
Auto 93,000 miles
DP Tuner F5
ATS Compressor and 1.0 Exhaust housing high flow back plate
Turbo Back 4" Silverline Exhaust Mbrp Muffler Delete
Isspro Trans,Pyro,Boost Triple Pod
Fumoto Oil Drain Valve
AIH Delete With Boost Fitting
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Last edited by vitalidle; 08-08-2007 at 06:08 PM.