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Ford Focus MK4 ST
The solution for more power is simple: more air plus more fuel equals a bigger explosion
Use of stage 2 software upgrade is strongly recommended
the modern stock airboxes are a plastic compromise resulting in flow-killing restrictions and entirely muted engine notes
followed by an engraving process
Pipercross Car Induction Kit PK172 Shift Ford Focus MK4 STPipercross Induction Systems remove the restrictive factory airbox to offer the maximum possible airflow into the engine. All filters use Pipercross composite airflow technology and systems are only released for production when they are bench flow tested and make an improvement in airflow performance. Pipercross induction sytems are highly recommended for optimum performance. They directly replace the oem airbox and intake pipe, allowing an increase
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