Ford Focus ST Forum banner
bypass valve
1-1 of 1 Results
  1. Focus ST Performance
    It appears that there is a lot of confusion going around about the bypass valve, the sounds it makes, and the job it is there to do. We'd like to clear things up so that you are aware of the way the OEM valve works, and how a tune or aftermarket components can affect it. Introduction to your...
1-1 of 1 Results