Iridium Spark Plug Set - RS

20
EcoBoost engines running substantially higher boost pressure or increased levels of tuning compared to the OE power output can experience reduced spark plug life resulting in lower engine performance, misfires and rough idle.

Increased wear is typically seen in the form of increased spark plug gap and degradation of the electrode. Using spark plugs that are optimised for increased power ensures maximum performance.

Extensive in-market validation at extreme boost / cylinder pressures was undertaken to ensure optimal performance was achieved, whilst also making sure  reliability and drivability wasn't compromised in colder ambients.

Each set is supplied pre-gapped by mountune to optimise the setting and allow for easier end-user installation. 

The NGK LTR71X-II is one step colder than the original spark plug.

Applications:
Focus RS 2016-2017

Features:
  • Smoother acceleration
  • Perfect for high boost applications
  • Supplied pre-gapped by mountune

Please note: Supplied in a pack of 4 plugs.


Customer Reviews

5 Based on 20 reviews
5 ★
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TE
31/05/2019
Tonny Eriksson

What to say.

Has nothing to say about these spak plugs more than if Mountune recommends these spark plugs for the m400R kit then just follow it to avoid problems.

MN
17/05/2019
Mr N.
United Kingdom

Cool plugs

Ideal for me as I have a trip across Europe + some laps of the Ring. Only heard good things about them so will give them a try. Car already feels smoother unsure if that’s just my imagination.

PB
04/05/2019
Paul B.
United Kingdom

Iridium spark plugs rs focus

Iridium was delivered 65 million years ago via asteroid to Mexico, it’s expertly mined and refined and is ultimately used to make my car go faster, so a few dinosaurs died when it arrived but I think you’ll find it was worth it


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