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i have a 96 f150 with a 351 all it has done to it is cold air intake and true dual flowmaster exhaust i was wondering about how much horsepower it has.
So, your cold air: 0 to 5 hp, as the OEM air intake was outside the engine compartment anyway. It may be less restrictive than stock, or not. Duals: Note the peak HP numbers are all under 4000 rpm. Thus, another probably 0 gain.
13 years and xxx,000 miles: -20 hp.
Looking for more hp? Conanski has the goods on the 351W. He may be by, or PM him. He posts in SBF regularly, as well as elsewhere.