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AIRTEC Motorsport Big Boost Pipe Kit for Focus MK4 ST 2.3 Size:Motorsport Silver Xtreme has officially released theAs 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