Need advice. (what next)

Your car comes with a supercharger already right? If so you might be better off getting a custom computer chip burned for your car. You can go with a smaller pulley for your supercharger. That's a real cheap bang for your buck. Don't worry you didn't actually "lose" any torque when you changed your pipes. it just moved further up your powerband, that's why you don't feel it down low anymore.