It works, but realize that the pcm compares the actual temp to values in a table. And that table has a floor. The pcm reacts no differently to 40 degree weather then it does to 20 or 0 degree weather. That means the powerwire wont do anything for you during the winter in WV. The power wire is a great summertime mod. Guys in the south can use it year round and see results.
Oh, I ran one for a number of years.