ALOT! umm I have a custom performance chip, K&N filter and mas air flow, JBA headers and custom exaust, underdrive pulley's, 4lb charger pulley. The truck gives out about 14 lbs of boost total. Probably about 430rwhp. The only problem i have right now is traction, I have 20 inch rims but the tires dont grip that well. I NEED SLICKS!!!!
Once i get some slicks i will probably run in the mid 12's. I love this truck!