Focus ST/RS owners! We keep these plugs in stock for fast shipment. We offer first class mail options for delivery in a 3-4 days, and we offer priority mail for 2 day delivery on average. We can get these to you fast!

NGK Iridium plugs are our best selling spark plug. Why? Well, they have excellent heat durability, put out a great spark kernel for efficient fuel combustion, eliminate stumbling, and maximize power! Its important to periodically replace your spark plugs as spark plugs wear over time and you'll lose power and efficiency.

Benefits of NGK Iridium IX plugs:

Iridium alloy has extremely high melting point, perfect for use in the turbocharged Focus engines. 

Trivalent metal plating provides provides superior anti-corrosion and anti-seizing properties.

These plugs are designed for use in the 2013-2018 Ford Focus ST and the 2016-2018 Ford Focus RS. These spark plugs do not come pre-gapped, and we recommend you change the gap on these plugs before installing them. The OEM spark plug gap is generally .027-.031 from the factory, and we recommend a gap of .025-.027. The more mods and boost you have, the lower the gap.

A set of colder plugs is available for those of you with tunes running higher boost levels, otherwise you should select a OEM heat range plug.

These plugs work on all 2013,2014, 2015,2016,2017,2018 Ford Focus ST models and RS models.

Note: This listing is for a set of four spark plugs. Quantity of 1 means a set of four plugs.