EU customers, please read before purchasing

Important Info

Search our store

33 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 33 Reviews
5 ★
97% 
32
4 ★
3% 
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:
    SS
    23/11/2021
    stuart s.
    United Kingdom United Kingdom

    Plugs

    I've never had to replace plugs, But the reason I changed them out was recently the car was jerky from cold and was missing sometimes around 3k in third and fourth. The old plugs had 45k and the gap was 0.9mm. The car definitely feels smoother.

    WC
    30/10/2021
    William c.
    United Kingdom United Kingdom

    Spark plugs

    Brilliant Ngk iridium

    mountune Iridium Spark Plug Set [Mk3 / Mk4 Focus ST] Review
    GW
    30/10/2021
    Grant W.
    United Kingdom United Kingdom

    Perfection

    The item was well priced but what did it for me Mountune pre-gap the spark plugs for you. So its simply boot them straight in and off you go