what is the best performance chip for my 2003 gmc sierra?

[kaleb a]

It is a v6 reg. cab short bed and i want to know what the best brand of performance chips are and what all i need

 

[bill]

I think programmers work better if they have predator for your car look into that. if not try hypertech you can adjust shift points and all that. also on some cars with performance chips the computer learns it and it no longer works

 

[Jastinne]

Jet chips performance module and chip dynamic spectrum is the best for your 2003 GMC Sierra.

 

[Hank Scorpio]

Leave it alone. These "chips" mess with the a/f ratio and you shouldn't mess with it unless you've got a wideband sensor. Atmospheric pressure is different in different places so there's no telling how different it's going to be where you live versus where it was tested.

 

[Molson02536]

It is a v6 reg. cab short bed and i want to know what the best brand of performance chips are and what all i need

Your 03 Sierra runs on a OBDII system and does not work on a chip system like the older obdI PCM. Your OBDII PCM can be reflashed for the tune your looking for. I my self stay away from the hand held tuners, give these guys a call and they can help you get your PCM tuned for what your looking for. http://pcmforless.com/

I my self is running a http://www.hptuners.com/ since i am a tuner junky LOL. Good luck and keep us posted.