This is as far as I am going I have two Trans ams to play with the GTP is my daily driver and the question is with the Mods in my Sig and I am getting a 3.4 Pully. What PCM should I go with. Overkill or DHP. Overkill cost more but I hear is a better tune. I do not think that I will ever need a retune thought because this is as far as I am going. I do not mind spending the money if it is a better tune