EU customers, please read before purchasing

Important Info

Search our store

43 reviews

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 43 Reviews
5 ★
98% 
42
4 ★
2% 
1
3 ★
0% 
0
2 ★
0% 
0
1 ★
0% 
0
Customer Photos
Write a Review Ask a Question

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:
    A
    23/04/2022
    Anonymous
    Taiwan Taiwan

    Nice service

    Good quality and excellent work for per-gap the spark plugs

    WE
    12/04/2022
    William E.
    United Kingdom United Kingdom

    Mountune Spark Plugs

    Made a noticeable difference in terms of rough idle and even noticed mpg has increased slightly!

    MR
    10/04/2022
    Matthew R.
    United Kingdom United Kingdom

    Pre gapped and ready simple

    Great plugs already gapped too so win win very happy