X4XZ Ignition Coil Pack & Double-Iridium Spark Plug Kit UF549 + 9029 — 4-Pack, Direct OE Replacement for Nissan & Infiniti Engines

The X4XZ UF549 ignition coil pack set with four 9029 double-iridium spark plugs is a direct replacement kit designed to restore spark reliability and smoother running for compatible Nissan and Infiniti engines.

If your vehicle shows signs of misfires, rough idle, or reduced performance, replacing both the ignition coils and spark plugs together is often the fastest way to address ignition-related drivability issues. This kit pairs four OE-equivalent UF549 coils with long-life double-iridium 9029 spark plugs (DILKA6RA11), providing a matched set engineered to fit multiple Nissan and Infiniti gasoline engines with plug-and-coil-on-plug configurations.

Which vehicle models and engines will this kit fit?

The set lists specific compatibility across several Nissan and Infiniti models. It covers a range of 1.6L to 5.6L gasoline engines used in Altima, Cube, March, NP300/Frontier, Rogue, Sentra, Tiida, Urvan, Versa, X-Trail, Pathfinder, and select Infiniti FX, M, Q70, Q70L, QX60, and QX70 models.

• Common Nissan matches include: 07–08 Altima 2.5L, 09–14 Cube 1.8L, 12–18 March 1.6L, 08–13 Rogue 2.5L, and many Sentra and Versa model years.
• Infiniti coverage includes select V8 and V6 models like 09–13 FX50 5.0L and 11–13 M56 5.6L, plus Q70 and QX-series years shown in the features list.
• Always verify your vehicle’s engine code and OE part numbers (UF549, 9029) before purchase to ensure exact fitment.

How do these coils and double-iridium plugs improve engine performance?

Replacing worn coils and spark plugs can reduce misfires, stabilize idle, and improve throttle response without modifying the engine. The coil pack's construction and the spark plug’s iridium electrode work together to deliver consistent, high-voltage sparks under varied driving conditions.

• Double iridium spark plugs offer extended service life and steady spark delivery over long intervals.
• Coils use a stainless-steel spring and ferrite noise suppressor to reduce radio interference and ensure reliable conduction.
• Thermoplastic connectors resist heat- and thermal-cycle fractures for longer connector life and reliable contact.

What should I expect during installation and maintenance?

The kit is built to match or improve on original equipment design, so installation is typically straightforward for any technician familiar with coil-on-plug systems. No printed manual is included, but basic steps are standard: disconnect battery, remove old coils and plugs, then install the new plugs and coils with correct torque and gap verification.

• Package includes: 4 ignition coil packs (UF549) and 4 double-iridium spark plugs (9029).
• Follow OEM torque specs and gap settings; use anti-seize/lubricants only if recommended by vehicle manufacturer.
• Check for diagnostic trouble codes after installation and clear/reset as needed.

What quality and support can I expect from X4XZ?

Components in this kit are manufactured to meet or exceed OE form and function, with features intended to extend service life and maintain stability under heat stress. X4XZ backs the product with customer service and a limited three-year product service period.

• High-quality materials and noise suppression components for dependable performance.
• Double iridium plugs rated for long operating life—consistent spark over extended mileage.
• 24-hour customer support and a three-year product service window for post-sale questions.

Who is this for? Professional technicians and DIY enthusiasts who need a matched set of ignition coils and spark plugs for mid-2000s through late-2010s Nissan and Infiniti vehicles will benefit most from this kit. It’s intended for owners seeking an OE-style replacement that improves ignition reliability and reduces the likelihood of misfires, especially when both coils and plugs show wear. Always confirm part numbers and vehicle compatibility before ordering.