FWIW: Just so you have another option you might look at the MDC unit that SmartMadness sells. It is a European design that has been installed in thousands of cars over there and like 451, hundreds already over here. It is a simplier "plug and play" installation and also works sweet. I have read dozens of posts on both and they seem to operate the same so there doesn't seem to be much to gain or loose there. The MDC however includes a booster, but I did't bother using that on mine. By all means, get the LED with either.