I would like to know how much of a HP increase i would grain from the following mods-
102mm ls intake(If it helps at all)
Cold air intake
DIablo sport
Long tube headers(No muffler, just cats.)
Atm, its a stock 5.3l with 134k miles.

 

With just the headers, cold air intake, and a tune you're lookin at around 40-50 hp dependin on how good the tune is. Never messed with the 102mm LS intake an have heard you actually lose bottom end but gain top end, but if you were to do a intake swap, look into the 07+ truck intakes. They pick up around 30hp