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Downpipe / Sports Cat [Mk3 Focus ST]

The mountune Downpipe / Sports Cat has been engineered for the mk3 Focus ST to reduce exhaust back-pressure at the turbocharger, allowing faster response and additional power.

Features include a large diameter 5” motorsport-type, 200 cell count metal substrate honeycomb catalyst, to ensure effective, ultra high flow performance in extreme environments. Constructed of 3” AISI 304 stainless steel mandrel-bent tubing with a CNC machined V-band flange that allows easy installation.

Additionally, robust OE-type mounting brackets and hangers are utilized to maintain perfect alignment and OE-like fitment. Also incorporated is an 8” stainless steel flex section to help absorb shock and prevent OE hanger failure.

Revised engine calibration will be required for optimal performance and may emit the EML without it.


  • Large diameter motorsport-type, 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 2.5” and 3” exhaust systems
  • TIG welded construction
  • Limited 2 year warranty*

Recommended to fit in conjunction with mk3 Focus ST Cat Back Exhaust.

*Please contact us for warranty terms and conditions.

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 35 Reviews
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      United Kingdom United Kingdom

      Downpipe / Sports Cat

      Very fast dispatch from the Mountune team and packaged up very well too. Cant wait to fit this along with the Mountune Cat back system and feel/hear the difference.

      United Kingdom United Kingdom


      Brilliant sounds nice picks up faster

      Fausto A.
      Italy Italy

      Very Good ;)

      The downpipe is a work of art, perfect welds, assembled yesterday, the sound does not change much if it is coupled with the original exhaust system (you can go unnoticed) but the performance combined with the mapping is excellent. The only drawback is that you pay attention to the customs taxes which are onerous if you buy from outside the UK. However convenient compared to buying in Italy, I recommend it.



      Glad you're pleased with our downpipe and thank you for the great product feedback! Just to clarify (for anyone else reading this too) with the customs taxes, you're now buying this product at 20% less than the pre-Brexit price as you're not paying our VAT and instead you pay this portion of duty to your own country. Most EU countries are around 20% duty anyway, so it will normally work out very similar to before, if no the same.