A-Premium Ignition Coil Pack and Iridium Spark Plug Kit for Subaru H4 2013–2016 — Set of 4, Bolt-On Coils & Pre-Gapped Iridium Plu

A-Premium’s set of four ignition coil packs paired with four iridium spark plugs is a complete replacement kit engineered for select Subaru H4 engines from 2013–2016.

This kit combines direct-fit ignition coils and long-life iridium-tipped spark plugs to restore reliable spark delivery, smoother idling, and consistent starting for compatible Subaru Forester, Impreza, Legacy, Outback and XV Crosstrek models. Each coil is a bolt-on blade-terminal design that mounts to the valve cover, and the iridium-plus-nickel plugs come pre-gapped for typical OEM-style installations. A-Premium backs this assembly with a one-year unlimited-mileage guarantee to give installers confidence when replacing worn ignition components.

How will these ignition coils and iridium plugs affect everyday starting and idle?

Replacing old coils and degraded plugs helps re-establish a strong, even spark at each cylinder. You should notice more consistent starts, steadier idle behavior, and fewer misfires that can occur with worn ignition parts.

• Coil terminal quantity: 3 with blade-type terminals for reliable electrical contact.
• Mount type: bolt-on, installs to valve cover for OEM-style fitment.
• Spark plug material: durable iridium on the center electrode for longer life.
• Pre-set gap: 1.0–1.1 inches (installation-ready range).

Will this kit fit my Subaru model and how do I confirm fitment?

The set is made for several Subaru H4 engines from 2013 through 2016; compatibility covers many Forester, Impreza, Legacy, Outback and XV Crosstrek gasoline models. Verify part compatibility by matching your engine code and the provided reference numbers before purchase.

• Compatible models include: Forester 2014–2016 (H4 2.5L), Impreza 2013–2015 (H4 2.0L), Legacy/Outback 2013–2014 (H4 2.5L), XV Crosstrek 2013–2014 (H4 2.0L).
• Reference numbers: SU003-00417, FA20, FK0438, UF-724 / UF724, UF-710 / UF710.
• Thread diameter: 12 mm—confirm against your vehicle’s OEM plug thread size.

What are the installation details and torque specs I should follow?

Each ignition coil bolts to the valve cover and connects with a blade-style terminal for secure electrical contact. Use the recommended installation torque for the spark plugs and take care to seat the coil mounts properly to avoid vibration or poor contact.

• Spark plug installation torque: 15–20 N·m (follow a torque wrench for accuracy).
• Coil mounting: bolt-on type to valve cover—ensure wiring harness clips are aligned.
• Gap specification: 1.0–1.1 inches pre-set for standard H4 applications.

Why choose iridium plugs paired with new coils over replacing only one component?

Iridium plugs have a finer, harder center electrode that resists wear longer than conventional nickel-only plugs; pairing them with fresh coils ensures the ignition system performs as a matched set. Replacing both parts at once reduces the chance of premature issues caused by a new coil driving an old, worn plug or vice versa.

• Iridium central electrode extends service life and preserves consistent spark intensity.
• New coils restore proper voltage delivery to each cylinder under load.
• Bundled kit reduces diagnostic guesswork and ensures matched replacement parts.

Who is this for: This A-Premium kit is for Subaru owners and independent technicians who need a direct-fit ignition coil and spark plug replacement for 2013–2016 H4 engines. It suits drivers seeking a reliable, longer-lasting plug material (iridium) combined with OEM-style coil fitment and clear reference numbers for parts matching, plus a one-year unlimited-mileage guarantee for peace of mind.