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4 reviews


Iridium Spark Plug Set [Mk8 Fiesta ST / Puma ST / Focus 1.5]

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.

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

Fiesta ST
Puma ST
Focus 1.5 (150PS / 180PS)

  • Smoother acceleration
  • Perfect for high boost applications

Please note:Supplied in a pack of 3 plugs.

Customer Reviews
5.0 Based on 4 Reviews
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Filter Reviews:
    Ryan W.
    Australia Australia
    Another Upgrade

    Mountune and NGK is a winning formula! Easy to install when you know what you're doing. Seems that bit more responsive, a must to run a colder plug when you're running higher boost especially running the M260 like I am .

    steven h.
    Norway Norway
    Great product

    As usual quality product from mountune and needed when running the M260 tune easy to fit and colder running

    United Kingdom United Kingdom
    Iridium plugs

    Fitted as expected slight performance increase eg throttle response