I am lost on the idea of buying a handheld tuner. I know that they are great and add power. But i dont understand what happens when u get into the high end upgrades such as nos, sc, turbo, heads, and cam. When u get ur car dyno tuned doesnt that tune just go on instead of the tune in ur handheld tuner? I am not sure on all of this that is why i am asking for ur guys help. I just dont know if i should waste the money for the tuner, since i am going to be doing a cam and some head work this winter so i will be getting my car dyno tuned.