I don't think there is any restriction valve in the system on his car . It also uses a hydro boost for the brakes that was made by hydratech .Restriction valve?? I was reading this thread and the guy was saying he had to get the fitting off a factory hose because the other fittings with the O rings would leak. Did you have to do this?
http://thefactoryfiveforum.com/showthread.php?8495-How-To-Coyote-Power-Steering
Sent from my iPhone using my fingers while my auto correct makes me seem illiterate