AIRTEC Motorsport 0 Cell Sports Cat Downpipe for Focus RS MK3. AIRTEC Motorsport downpipe for Focus MK3 RS. The Original Catalyst and down pipe, unlike the older ST225 and Focus RS mk2, are made in one piece. This new design features some restrictive bends and an exit bore size of only 55mm.
With a new bore size of 70mm the new Airtec Motorsport performance Replacement Down Pipe has over 50% more capacity. AB10, AB31-AB39, AB40 - AB42, AB43-AB45, AB51-AB56. FK19-FK21, HS1-HS9, IV1-IV28, IV30-IV32, IV36, IV40-IV49, IV51-IV56, IV36. KA27, KA28, KW1-KW3, KW5-KW17, PA20-PA39, PA40-PA49, PA60-PA78, PH1, PH5-PH9, PH10, PH15-PH26, PH30-PH44, PH49-PH50, ZE1-ZE3.