I am in the same boat, thought I would be able to adjust more parameters with this unit on my 07 Yukon. TM was a biggie for me. I guess I should have been more careful when reading about it, but it was pretty unclear on which parameters my predator had to adjust. Oh well, I guess I will just be ...

Okay, so I am an idiot on the serial port issue but to my credit my computer is in a hutch and it was dark back there. It looked to be the same shape.

Back to the question. Do I need to update if a drive an 07 Yukon with a 5.3 and my tuner has the v.8r07 software on it? Does it change anything to ...

I have an 07 Yukon with a 5.3 non flex with cylinder deactivation and the serial number of my tuner is d00a157 and was born on 8/10/2007. I bought the serial cable to do updates but my computer only has one serial port and it is the monitor. What do I do to update if I need it?