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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...
    air filter focus st forced induction rs airbox stock
  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.
    air filter green air filter high flow mountune
    $35 USD
    1
  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
    air filter fswerks
  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...
    air filter focus st green air filter intake sounds turbo noise
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