Hybrid injectors with a GT38R turbo and good tunes have proven 450+hp on about every truck that has that combo. The best part about injectors is you can have then de-tuned if you feel you have too much power. I had my truck de-tuned before I had head studs so I would not blow anything up. Then after I put in my head studs I had the tunes maxed out.
Injectors:
99-03 Injectors
http://www.totaldieselperformance.co...lts.asp?Cat=45
Turbo:
99-03turbo
Garrett Ball Bearing Turbocharger
I am sure there are other site vendors that my be able to save you some money so a little homework is in order.