AIRTEC Motorsport Big Boost Pipe Kit for Focus Mk4 ST 2.3



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, we’ve created a comprehensive solution to improving the car’s 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 pipework’s flow and efficiency.


• Comprehensive 11-piece kit designed specifically for the Mk4 Focus ST
• Larger internal diameter pipework offers improved flow
• Lightweight aluminium construction for increased strength
• Precision engineered CNC connectors
• Comes complete with all fixtures and fittings

Will not fit automatic models.



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