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2536-ISP-AA

Iridium Spark Plug Set [Mk3 Focus RS]

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 2016-2018

Features:

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

Please note: Supplied in a pack of 4 plugs.

Customer Reviews
5.0 Based on 46 Reviews
5 ★
100% 
46
4 ★
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Filter Reviews:
    R
    18/05/2022
    RSFrankie
    United Kingdom United Kingdom

    Spark Plugs

    Had these fitted by FJRS along with some other performance parts. Definitely worth doing especially when increasing power. The car runs lovely and smooth!

    D
    21/04/2022
    Dimostenis
    Sweden Sweden

    Fast shipment, great quality and fast support!

    Refering to answer above

    PD
    29/03/2022
    Paul D.
    United Kingdom United Kingdom

    Iridium sparks

    Good quality spark plugs...fast delivery..usual mountune service...perfect...thanks..