Neb you'll have to purchase the v2handheld/software from many resellers which one you choose is up to you and then you'll have all the stuff you need to flash log tune the adjustments are infinite or you can have a tuner write you custom tunes. Since you haven't filled your sig out I'm going to guess you have a 05 sclb? The v2 will be perfect but you'll have to into account your stock transmission there again I'm guessing the website is efi live.com and look for "resellers" and go from there hope this helps
sorry I have not got all that setup. I have an 07 lbz, I was kinda sorta hoping that I could so most everything from the laptop where I have heard people doing so themselves. kinda soulds like it would be cheaper that way cause the flashscan v2 is kinda outta my price range