Just bought a 2004.5 Gmc 2500hd 4x4 with a lly it had a blown head gasket when I bought it and been sitting over a year I only paid $2800.00 for it, drivers side body needs a door and a fender and some bed repair but since I didnt pay much for it I thought its worth putting some money in it. as I was rebuilding it I decided to upgrade a few things my question is what kind of hp should I expect out of a lly duramax that has EFI live w/dsp5 switch, rebuilt heads, ARP head studs, grade c head gasket, ppe ported fuel rail fitting, fass lift pump, cp3 mod with orifices removed, shimmied Release Valve, AFE mouthpiece, S&B filter, PCV reroute, larger cp3 fittings, EGR delete w/fingerstick. thats all I got done now, is there anything I missed that you would recommend me doing. the transmission is going to get built as soon as this one fails.

 

Performance Exhaust Manifold, Turbo Outlet Pipe, Downpipe, MBRP 5" Straight Pipe, and maybe some over 30 Injectors, or another turbo. It really depends on your budget. You could be in the 700's with what you listed and what I have listed.

 

500 hp range with a built trans.