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K&N 57i Cold Air Intake - Fiesta Zetec S - Before and After - Sound Comparison - 4K

Scott van Breda
A comparison of the K&N 57i intake vs the stock filter. This comparison was done up to around 4-5000RPM.
The K&N has a much more aggressive sound, not so noticeable while stationary, but under load it is significantly better sounding and louder than stock.
As for performance, the throttle response and power seems to be slightly better at the higher revs.

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