Has anyone used any performance enhancing chips in their Santa Fe? I am talking about a device that helps regulate the air/fuel ratio in a way that gives added horsepower, torque and better gas mileage. I have looked at a variety of companies on line. I am looking for some real life testimonials before moving forward on this. I once used this technology in an Escalade I had back in 2004 and noticed a difference but was curious if any Santa Fe owners might have gone this path. Any feedback would be welcome.