I just got it and it has an intake DC Sport Headers and a full exhaust already. What are a few minor things I can do to make it pick up some torque. It seems to lag on that side but horsepower is awsome. Also this guy I know is selling a LS VTec Engine built from the ground up w/ a supercharger that is brand new and has about 600HP for $4000. Should I go for it or keep my GSR engine w/ 85000 miles on it?