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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.

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    5.0 Based on 31 Reviews
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    Filter Reviews:
      United Kingdom United Kingdom
      Satisfied Customer

      Superbly engineered, high quality product. Major improvement over OEM item.

      mountune Downpipe / Sports Cat [Mk3 Focus ST] Reviewmountune Downpipe / Sports Cat [Mk3 Focus ST] Review
      Gaspar R.
      Hungary Hungary
      Very good

      Very good Good sound

      United Kingdom United Kingdom
      Downpipe / Sports Cat [Mk3 Focus ST] Excellent quality and value for money

      I managed to pick this fantastic item up in the sale, haven't installed it yet, very high quality compared to other makes that I've seen. The welding is a work of art, It's a shame it hidden behind the engine. Very fast delivery and superb customer service from Mountune.