Randye - save you money and buy some cool chrome stuff
. That 6.7 is the ultimate power machine and the only one that benefits from those gadgets are the gadget marketer. Why look for more power if you have all you could ever use. Cool down is just a driving habit for the most part - pulling off the highway, into a neighborhood, or even work is usually slow enough cruising to effectively cool down. If not, just let it run a bit.
A lot of sad stories out there when push comes to shove and the Dealer finds the chip or evidence it was there.