hi, i'm interested in a tune for my 07 srt8 gc, i just bought a borla"S" exhaust and im planning in buying a cai, 180 t-stat , and a nx system with anything fom100 to 150 hp, i live in texas and believe me it's hot here110, but in winter goes down to 20'S, also do i have to buy the predator tuner from someplace else or can i buy it from u too? thanks.