How much HP do you think you have stock? Add that with tunes HP and minus about 20-30% from driveline loss and hype. I think that would provide an honest ballpark figure. 
__________________ 08 Sierra WT CC SB
Steel Gray 4x4 PPE RACE
Modded OEM AirBox/PCV Reroute/4" MBRP into 5" MagnaFlow/ EGR BLOCKED
Isspro EGT/Boost gauges Cognito Leveling Kit/HD Tie Rods  Pitman/Idler Support Brackets/Bilsteins
Pirelli Scorpion ATR 265/75/16 Coated OEM Wheels
Factory Oval Steps/Rhino Lining
Klein Air Horns (4)/ViaAir 150 psi 2g compressor    |