speed76demon

Alright now i've been reading about pcm and if i understand right i can purchase some cables for 90bucks and then he will send me a program through and email for 50 bucks and i can then load that in my car from my cpu is that correct?? Also if i make changes to my car he will just send me the new program there after for free if im wrong please correct me. Also if you have any comments how this system works please feel free to tell me thanks for your help