Intake / Exhaust / Gauges. Those are a few of what I call "supporting mods." With the exception of the governor spring, pretty much anything else is wasting your time, or risking your engine.

After that, the sky's the limit.

 

I have a 91 dodge w250 single cab flat bed 4x4 with winch i am trying to find out how to get more horsepower without putting anything on the truck