early 99 powerstroke
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Let us know what your power goals are, if there is a budget constraint and what you use the truck for...
First thing you should do is change all the fluids since you just bought it.
First mods should be intake, exhaust and gauges...
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Look into getting some gauges, air intake, exhaust, and then some custom tunes on a TS based chip.. That will get you around 300rwhp and be as reliable as it gets... After that you have to upgrade injectors, turbo, transmission, fuel system... It starts to become less reliable and really an expensive slippery slope...