Downpipe / Sports Cat - RS


The mountune Downpipe / Sports Cat has been engineered for the mk3 Focus RS 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.

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.

Supplied with adaptor sleeve to suit either the OE cat-back or mountune cat-back exhaust.

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 OE / mountune cat-back exhaust

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

    Customer Reviews

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    Joseph W.
    United Kingdom


    Was a bit unsure about this as the V3 exhaust is loud enough at 5/6am so didn’t want anything too loud as I’m sure the neighbours wouldn’t appreciate it. When this is combined with the V3 exhaust, on start up and normal driving, somehow barely sounds any louder than before. When you get the change to put your foot down and open it up though, you certainly know it’s there. The roar and sheer noise this thing helps the car to produce is insane!! Definitely something I’d recommend, after all, you don’t buy a RS to blend in do you?


    Sport Cat Fitted

    Had the Moutune Sport Cat fitted in the workshop at The same time as my new V3 exhaust, service was excellent and the quality of the product is second to none. Kept informed of progress and was really looked after in the waiting area, shout out to Amy and Ryan! Cheers guys I’ll be back!

    United Kingdom

    Sports Cat

    If you have got the cat back exhaust then I would recommend getting one of these. Unfortunately in the process of fitting at TC Harrison at Burton on Trent Mountune Profit Center who we’re most helpful the two studs holding the original item on sheared so the turbo had to come of which resulted in a bill of £1,000. But I must say it makes a vast difference in the sound of the exhaust makes me smile so even after the bad luck I think it was money well spent. Can’t take it with you.

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