I have the SCT SF3. Got it from AM (American Muscle), comes with free tunes for life from Bama Tuning (they work with AM). I got the combo with a JLT intake. Big difference! Bama Tunes guys are great, and they send tunes pretty quickly. Obviously I'm a little biased but that's my experience. The tuner also doubles as a code reader, which is nice if you ever get a check engine light. It pulls the codes and can help diagnose the issue at hand, as well as clearing the codes. Welcome to the forums!

 

Go with AM combo they have. Dont buy used stuff in my own opinion