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You won't gain much power with a 4" exhaust, but you will gain cooler egt's,
especially when towing heavy. If you're not having high egt's issues, now, and are happy with the way the truck sounds, you're best bet would be do swap out the down pipe (as suggested). Tymar sells one that will fit good and bolt up to your stock cat (if you still have it).
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1997 F250 4x4 Crew Cab PSD; Modded H2E, FFD Stage 2's, CPR Fuel, SRP1, ARP studs, Comp 910's, DI pushrods, Dana 60; Sky RSK w/SD springs.
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