Originally Posted by 99limited
how hard are these to install? what are colder plugs and a 180 stat?
Colder plugs= spark plugs. These should be easy to get to on a 4.0 WJ.
180 stat= 180 degree thermostat. This helps regulate the flow of coolant so that it runs cooler. I haven't done one on a 4.0, but I imagine that it's easy enough if you take your time and follow instructions.
Superchips is a PCM programmer. If you can read english and plug it in to the OBD2 port under the steering column, you can load up a tune. Its really not that hard.