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As part of our expanding Mk4 Focus platform product range, AIRTEC Motorsport is proud to launch our big boost pipe kit for the ST suitable for track or fast road use.
Developed in-house at AIRTEC HQ in the UK, weve created a comprehensive solution to improving the cars original pipework to allow more flow and capacity whilst reducing restriction and improving response.
The comprehensive 11-piece kit features three pipes constructed from lightweight aluminium for improved strength so they will not fail with higher boost pressure, six Pro Hoses silicone joiners as well as two CNC-machined connectors to make fitting as simplistic as possible.
On the hot side coming from the turbo, the original pipework is 55mm and features an indented section which restricts flow, where as our enlarged replacement kit features a 60mm internal diameter from start to finish with no restrictions.
For the cold side to the throttle body, the original pipework begins at 55mm and tapers to 63mm in diameter, but out replacement features a 63mm internal diameter throughout, increasing both flow and capacity.
The kit requires no additional drilling or cutting to fit and comes complete with all the correct fixtures and fittings, as well as detailed instructions.
A must have for any modified Mk4 ST to help the improve the boost pipeworks flow and efficiency.
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To ensure the part(s) you have ordered fits your vehicle, we run a compatibility check prior to dispatch. We can do this either using your registration number or the last 7 digits of your VIN. Simply enter your car details prior to checkout.
AIRTEC-ATMSFO132
Manufactured by
AIRTEC Motorsport

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