power boost valve?

  1. Regular Poster Joined: Oct 2007 belfast Posts: 264 IMPREZA WRX
    #1
    some people tell me these work quite well then others say they are a waste on money. has anybody used one of these before?
  2. Saxperience Hardcore! Joined: Dec 2005 e-hollywood Posts: 17160 toyata hilux
    #2
    search is your friend