Downpipe / Sports Cat

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 27 Reviews
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      Worth the upgrade

      Bought as part of the MR300 upgrade,very worth it .

      Paul J.
      United Kingdom
      Exceptional product

      I managed to buy this with ease and if anyone knows Mountune most things can be out of stock! Fitting was a little awkward as done on stands and not much clearance. The engineering of the product itself is what makes me buy Mountune! Not much difference with sound but the Turbo spoils faster!

      mountune Downpipe / Sports Cat Reviewmountune Downpipe / Sports Cat Reviewmountune Downpipe / Sports Cat Review
      Guy B.
      United Kingdom

      Not had time to fit as yet but first impressions of the product are it’s a well made quality product.