Modest power and economy:
Intake, Exhaust, Programmer, Gauges (about $2000)
Little more Power:
Add Injectors and Turbo upgrades, tranny upgrades, and nitrous/meth/propane (add about $4000-10,000)
All out:
the above with custom tunes, headwork, cam, built internals, dual hpop, fuel system, etc! ($Sky is the limit...think about morgaging your house!)