Some performance chips work fine, though I don't think any good ones are made for Sorento V6 as yet. These are $250-$350 price range, not the scam $50-$100 ones. The good ones really modify your computers programing and can be tailored to your requirements.
KIA aftermarket apparently not yet interested in the V6. I think when we get the newer larger V6 that the Genesis is using with direct injection, etc. that will make the V6 come alive even more.
Not sure you can do much with chipping non-turbo engines, 4's or 6's. Chips work best and get the most bang-for-bucks with turbo-ed engines by remapping the boost characteristics. There may be options for the turbo GDI but that's not available on the Sorento so that's mute I guess ... I'd say spend your mod $ elsewhere.
There's not a whole lot you can do with a normally aspirated engine in terms of "chipping". I suppose you could theoretically advance the timing a little if you wanted to always use premium gas, but I suspect the performance gain would be minimal.