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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 46 Reviews
5 ★
98% 
45
4 ★
2% 
1
3 ★
0% 
0
2 ★
0% 
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1 ★
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Filter Reviews:
    MN
    25/06/2022
    Matt n.
    United Kingdom United Kingdom

    Mountune plugs

    Wow what can I say ordered them Wednesday and were at my door the following day , managed to get a cheeky discount too took me no more than 20 minutes to do car recently had a stage 1 map and with these plugs the car runs so much smoother than it did highly recommend

    A
    10/06/2022
    Anonymous
    United Kingdom United Kingdom

    Spark Plugs

    Great Service Thanks

    J
    02/06/2022
    Jake
    Australia Australia

    Do what they are supposed to do

    Bought these because of a lot of positive reviews, plus having the m330 tune. Not a bad price for the plugs and made sense to upgrade, engine runs nice and smooth with the m330 tune on my MK4.