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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 56 Reviews
5 ★
100% 
56
4 ★
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Filter Reviews:
    PC
    13/11/2023
    Peter C.
    United Kingdom United Kingdom

    Spark plugs.

    Fast delivery and they were gapped ready to fit , Focus RS Edition .

    BS
    10/11/2023
    Brett S.
    United Kingdom United Kingdom

    Spark plugs rs

    Excellent service

    TT
    17/09/2023
    Troy T.
    United Kingdom United Kingdom

    Iridium spark plugs

    Perfect fit in the focus rs mk3 and seem to work well will be sticking with them feom now on