Had mine replaced at the dealer due to a "weaping leak".
Had to have dealer do it (I have no idea what I am doing) and due to Vince not making "house calls" and not visiting KC in quite a while!!!
Have no idea if I have more power or not, but I was told that it would definately help with controlling and regulating my fuel pressure better since I still had the stock spring in it after +200,000 miles..... so at least I am not leaking expensive diesel fuel anymore!!!