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2363-ISP-AA

Iridium Spark Plug Set [Mk3 / Mk4 Focus ST]

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 ST 2012-2018
  • Focus ST 2019-current

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 50 Reviews
5 ★
98% 
49
4 ★
2% 
1
3 ★
0% 
0
2 ★
0% 
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1 ★
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Filter Reviews:
    JK
    13/09/2022
    Jonathan K.
    Belgium Belgium

    Runs smoother

    After installing the new plugs, the engine runs a lot smoother! Definitely worth the upgrade!

    PM
    25/08/2022
    Paul M.
    United Kingdom United Kingdom

    Worth the Money

    Pondered a while on these and read many reviews and options. decided to try these as the car has stage 1 mountune . Made a distinct difference can tell a big difference against the ford plugs which were in the engine.

    A
    14/08/2022
    Anonymous
    United Kingdom United Kingdom

    Spark plugs

    No issues car seems to run better