Hi there all...
I got a Gen-IV V8 2008 GMC sierra 2500 HD truck (stock), and I want to get some more HP from it, well I am totally new to use the EFILIVE tune, and I am thinking of changing the TIMING, and when I went to the Spark menu i got LOST!! i don;t know what to change!!so anyone can help me to kick up my truck's HP !!! thanks a lot