[ChevyHighPerformance]

HummBebe's link is the first negative thread on another site that I have seen regarding PCMforLess. Some HPTuners info regarding the coloradofans.com listing of people with HPTuners - the cost to buy two credits to tune a single I5 VIN is ~$100 and the cost for six credits to do a complete year of a single type vehicle is ~$300. (The colorado/canyon and H3 are considered different vehicles as far as HPTuners goes.) My point is that the people listed with HPTuners may charge a little more to cover the additional costs for credits because they probably have licenses for colorado/canyon not the H3.

I don't think the JET chip will alter the shifts are recalibrate for different tire sizes. So I don't think JET will work for you.

It looks like you have three choices:
1) Buy HPTuners and do the tune yourself for ~$500.
2) Mail order tune - from PCMforLess, for example, for $199 + shipping
3) Contact one of the people near you with HPTuners from HummBebe's link.