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  1. Focus ST Performance
    Hello! I bought a 2016 Focus ST and I want to change the oem airfilter with a k&n filter so I can just wash it so I don't have to buy a new filter every time and the lid of the Focus RS air-box because I like the sound of forced induction, and I want to know if I have to tune the car in any...
  2. Sold Sold Sold
    A. Item for sale: Mountune High Flow Air Filter v2 B. Condition: Used C. Price/What you want to trade for: $35 D. Location of item: Will ship in US - 48 Contiguous states Only had 10k miles on it, good condition and plenty of oil still on it.
    $35 USD
  3. Focus ST Discussions
    I just bought a 2013 St3, there is a fswerks plate and air filter on it. I am trying to smog it in California but do not have a sticker saying carb compliant. Any help on what I can do to pass. Possibly put a compliant filter on but I am not sure where to find that either
  4. Focus ST Discussions
    Hey all, So I have a green air filter in my 18' ST1, love the flutter and conservative(ish) bypass valve sounds on liftoff and change. For a while, I tried running with the airbox off, love all of those liftoff noises with the box off but the constant sucking intake noise from inside the cabin...
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