I know that all it took for me was the 93 tune! I have FIPK2,Flows,93 Nelson(0 TM),Transgo+vette,cooler and 3.42's(will be 4.10's thursday) and before the Nelson tune I couldnt spin tires but with it I can do it almost anytime and I know I will be able to at will with the 4.10's. I know your truck is a little heavier than mine and you have headers so the 93 will do the trick and the 4.10's will melt them!
03' Silverado EC--LS1-4.8 Heads, Truck Intake, K&N FIPK II, Flowmaster 50 Series, 4.10's, FastChip Tune, Free Mods, Taylor Thunderbolts, TR6's, B&M Supercooler,Transgo Kit,Vette Servo, Ported TB, 160 Stat,Comp 212/218 Cam,Comp Pushrods, K-Motion Springs,TNT F-1(100 shot)
Projects: LT1 Fans w/Harness,LS1 Intake,Vette Covers,
LS1 Injectors
-----------O & A Party Rock--------XM 202------------