X4XZ Ignition Coil and Double Iridium Spark Plug Kit for V6 Nissan/Infiniti/Suzuki — 6 Coils & 6 Plugs, Direct Fit

The X4XZ UF349 + 224018H515 kit provides six direct-replacement ignition coils and six double‑iridium spark plugs engineered to restore reliable ignition and smoother engine performance for compatible V6 Nissan, Infiniti and Suzuki models.

This complete ignition pack pairs high-quality coils with long‑life double iridium plugs to help eliminate misfires, rough idles and inconsistent throttle response caused by worn ignition parts. Each coil and plug set is manufactured to meet or exceed original equipment form and fit so installation is straightforward for professional mechanics and experienced DIYers alike. The kit covers a broad list of late‑model Nissan and Infiniti V6 vehicles plus the Suzuki Equator V6—see compatibility details below before ordering.

Which vehicles will this ignition coil and spark plug kit fit?

These parts are designed as direct replacements for a range of Nissan and Infiniti V6 engines and the Suzuki Equator V6. Compatibility is broad across model years—confirm your engine code and part numbers against the vehicle fit list prior to purchase.

• Infiniti: 2002–2004 I35 (3.5L), 2002–2003 QX4 (3.5L)
• Nissan: 2002–2006 Altima (3.5L), 2005–2018 Frontier (4.0L), 2002–2008 Maxima (3.5L) plus select 2016 Maxima
• Also fits Murano (2003–2008, select 2015–2016), Pathfinder (2002–2004 3.5L and 2005–2012 4.0L), Quest, XTERRA, NV series, and 2009–2012 Suzuki Equator V6 (4.0L)

How do the double iridium spark plugs and coils improve engine behavior?

The double iridium plugs deliver a consistent, high‑temperature spark and an extended service life compared with conventional plugs. The ignition coils are built with robust housing, a stainless‑steel spring and internal ferrite suppression to maintain strong voltage delivery while reducing electrical noise.

• Double iridium tip for stable sparks and long life—rated for extended mileage
• Premium coil materials resist heat and thermal cycling
• Internal ferrite noise suppressor reduces radio frequency interference
• Thermoplastic connectors designed to withstand repeated installs and engine heat

What exactly is included and which OE numbers does it replace?

The package contains six ignition coil packs and six double‑iridium spark plugs—enough for a full V6 replacement. Each item is matched to the listed OE references so you can cross‑check compatibility with your vehicle’s original part numbers.

• Included: Ignition Coil Packs x6, Double Iridium Spark Plugs x6
• OE/Replacement references: UF349, 224018H515 and multiple cross‑reference numbers such as C1406, 22248‑8J115 and 22448‑8J111
• No printed manual included; basic installation requires common tools and standard safety precautions

Can I install these parts myself and what service/support is available?

Enthusiast and mechanically confident owners can replace coils and spark plugs with common hand tools and proper torqueing. If you prefer professional service, any shop familiar with V6 ignition systems can complete the swap quickly. X4XZ provides after‑sales support for installation and product concerns.

• 1 year product support from X4XZ and 24‑hour customer service channel
• Follow factory torque specs and anti‑seize/boot care recommendations during install
• If unsure, have a certified technician perform the swap to avoid ignition system damage

Who is this for? This X4XZ ignition coil and double iridium spark plug kit is aimed at owners and technicians working on compatible Nissan, Infiniti and Suzuki V6 vehicles who need a full‑bank ignition refresh. It suits drivers seeking durable parts that match OE fitment, fleet managers performing scheduled maintenance, and DIYers comfortable with engine‑bay repairs. Always verify compatibility with your vehicle’s VIN, engine code or original part numbers before ordering.