If you want to get into the 12s with a full size truck you are going to need to put some serious boost to it. Don't forget that 15 lbs of boost with a turbo is free horsepower vs 15 lbs of boost with a supercharger that consumes hp to make hp. Sell the charger and go turbo or add some NOS to get the hp up there. You're going to need somewhere around 500 hp to get into the 12s. Don't forget to take everything out or off the truck that is dead weight when racing. There's some kind of equation of 100 lbs equal .1 seconds on the strip.