Diablosport Forums

Hello, I have a 2009 GMC Sierra Denali AWD. I just recently purchased a DiabloSport I2030 and not really sure what I am doing. I did the 93 octain tune, turned on hard shifting, removed the rev limiter and put in my tire size. it seems to have made a little difference but I am wondering what else I can do with it.

Thanks in advance.

Consider or look into a custom tune... You'll really see a difference there...