hey getmygun,
Exhaust modifications will help free up Low-End power, and an ATS manifold will free up High-end power.
Check out my sig for the Exhaust, mods I have done to my truck.
Also a new Air filter will do good. The "Moparguy Big Honkin' Air Filter" (BHAF) is a really good choice for flowing more air.
I have spent about $600-700 doing exhaust modificatios,, and I can tell you,, the mods I have done won't even come near the power, say a PE COMP will get you. The comp, around $1K can get you +120 HP of what your truck is making now.
One mod I recommend you do 110% is GET GAUGES Guages can make your wallet a bit lighter, but is cheaper than a melt down of a $$ Turbo Diesel Engine.
MerrickNJr
P. S. Are you going to the Texas Rally 2001? I am 18 yrs old and plan on going.