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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. Focus ST Accessories
    I have a 2013 FOST ST3 (Bone Stock) and looking to upgrade to an RS airbox lid with possible pairing it with an intake inlet elbow, snorkel and grill shutter delete? Does this provide and good sound? Does it change temps at all good or bad? Does it have any negative effects? Thanks, any info is...
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