I added this to the manual on my 2000 Pontiac Firebird 3.8l and I can feel the difference with the cruise control as the instructions say it can be used with CC when safe to do so. With that said, uphill I know my car, even with the setup, can climb a steep hill in New Mexico not only with CC, but with it (and also with the addition of a Powermaster 165A high output alternator. also available on amazon ) and the right setting (I also have a "Big 5" update with 4ga ofc), the chip will fire and accelerate 5 mph past the set mph, so if I'm going up a big hill it'll accelerate by at least 65 to at least 70 and even after hitting the top I've also been researching and hearing people say "don't buy, don't buy it's a waste of money!" I don't listen to the people trying to put them on new cars, that are already trimmed for maximum fuel economy but older cars work best so in my case it has worked for me if I drive this car every day by all means and I pay attention to little things like after the inst allation and i drove faster than usual through a red light to check and i broke the gearbox mount on start up, didn't really try but it happened but not at all angry, i can install myself, i was just glad there was more torque to engage the gearbox's rubber mount. I've driven this car many long distances and kept it in tip-top shape, but it was definitely worth it, don't listen to the 'discount' racers. f-150 to see what happens. I also exposed the copper wiring on the sensor wires and squeezed the included metal clamps together for better metal-to-metal contact.
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