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Downpipe / Sports Cat [Mk4 Focus ST]

The mountune Downpipe / Sports Cat has been engineered for the Mk4 Focus ST to reduce exhaust back-pressure at the turbocharger, allowing faster response and additional power.

Featuring a large diameter motorsport-style, 200-cell count metal substrate honeycomb catalyst, to ensure effective, ultra high-flow performance, the mountune  downpipe sports cat is also constructed of 3” AISI 304 stainless steel mandrel-bent tubing with TIG-welded joins throughout for performance, reliability and aesthetics.

Additionally, robust OE-style mounting brackets and hangers are utilised to maintain perfect alignment and OE-like fitment and also incorporates an 8” stainless steel flexi section to help absorb shock and prevent OE hanger failure.

Revised engine calibration will be required for optimal performance and will emit the EML without it, but by simply replacing your downpipe and removing the inherent restriction, you can expect a peak performance gain of 10PS and 10Nm, with an even more substantial torque increase spread across the entire rev-range. 


  • 10PS / 15Nm peak power / torque increase
  • Large diameter motorsport-style, high-flow 200 cell catalyst
  • 3” AISI 304 mandrel bent stainless steel tube
  • Robust OE-type mounting bracket and hangers
  • 8” stainless steel flex joint
  • Compatible with all exhaust systems that retain the factory break point
  • Supplied with required gasket and hardware
  • TIG welded construction

This product has been designed and is intended for UK markets and complies with UK MOT tailpipe emissions regulations. Installation of this part on a vehicle that is driven on public roads outside the UK may violate other territories laws and regulations relating to emission requirements and motor vehicle safety standards.

    Customer Reviews
    5.0 Based on 7 Reviews
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    Filter Reviews:
      guido m.
      Belgium Belgium

      Ford focus mk 4

      Rijd super vlot zeer aangenaam vooral op laag toeren voel je de koppel enorm

      mountune Downpipe / Sports Cat [Mk4 Focus ST] Review
      Taiwan Taiwan


      Perfect product quality, fast shipping, pretty complete packaging. This product makes the car perform better

      mountune Downpipe / Sports Cat [Mk4 Focus ST] Review
      United Kingdom United Kingdom

      Great product

      Great, had to wait a little for Stock, but Mountune online team were always happy to help, Downpipe was a little tricky to fit, but no major problems, couple this with the sports GPF, exhaust and M365 map, this product really brings the car to life, absolutely love it, 3rd and 4th gear pull is epic and addictive !