Hello
A free flowing 4 inch exhaust system (Several companies offer good kits)
A power chip (Or in your case, the 96 requires an ECM swap)
Depending on the ECM program you choose, a turbo master waste gate controller would be good.
Set max boost to about 12 psi
If your truck does not have the cooling system upgrades (Dual t stat set up and high flow water pump) this is good.
A gauge set (Boost and an exhaust gas temp gauge "pyro" )
The combination of the exhaust and the reprogrammed ECM will give you about all that's easy to reach
There are several vendors that can help.
John Kennedy
Bill Heath
There are others, but these are two I am familiar with and trust.
Several companies offer larger exhaust systems for these rigs, and the big deal is BIG PIPE and a free flowing muffler.
If your interested in more $$$$$ a turbo upgrade can help some.
Hope this helps
Missy