I am a new H3 owner. I purchased it last month. I ran across the GF Performance chip in which the advertiser claims adding the chip will help with performance and fuel efficiency. I don't want to do anything that would mess up my hummer by throwing off the calibration or timing. And I don't want to add the chip if it will cause damage that I might not be aware of. Does anyone in the Hummer Kingdom have any first hand knowledge of these chips and how they effect the performance of a hummer? I would love to save a few bucks and increase the power, but I also don't want to cause any damage. Thanks!
Last edited by Dman
on Thu Aug 11, 2011 6:32 pm, edited 1 time in total.