I'll be getting a 97 f-250 HD extended cab swb with a 7.3L PSD and 5 speed manual trans and was wondering what the advantages of adding propane would be? The truck has a gooseneck hitch installed and i might use it to tow a trailer at some time.
From all the sources I've spoken to, propane is the single biggest gain in power you can put on a diesel. It isn't the cheapest way to get power, but it is the most productive, with horsepower gains of 60-100 rwhp reported. It will make your truck run cleaner, and will also increase your mpg.
Though chips will advertise that they increase your power that much, the dyno proves otherwise.