The only drawback is the factory inlet tube from airbox to the turbo itself, that is where ETS comes in to save the day. This kit replaces a 100% of the factory inlet tube and converts the filter from 2.5" to 3.0" for even better flow. This is the ONLY intake modification you should be making on your Focus RS!
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How much for just the filter? I already have this intake.
This is the filter you are looking for.