I don't want to spend a fortune. I've been told that the chip off the shelf really doesn't enhance power very much but that it does turn on the main fan sooner. I have a front fan switch in already but here in So. Cal. we drive a lot of bumper to bumper and heat is always a problem. So I thought if the chip would offer a little more peace of mind that would be great. I am aware that there are some other ways to control the main fan but the chip seemed to be the simplest (and if I do get a small power boost all the better).