X4XZ Ignition Coil & Double-Iridium Spark Plug Kit 6-Pack OE#22448-AL61C — Direct-Fit, Long-Life

Complete 6-pack ignition coil and double-iridium spark plug kit designed to replace OE# 22448-AL61C and restore smooth ignition across compatible Nissan and Infiniti V6 engines.

This X4XZ UF401 & 4469 kit combines six ignition coil packs with six double-iridium spark plugs to deliver a direct-fit replacement that mirrors or improves on OEM specifications. The components are engineered for consistent spark delivery, reduced radio-frequency interference, and longer plug life than traditional producers. This assembly is intended for owners and technicians who need a straightforward swap to address misfires, rough idle, or reduced engine responsiveness on supported models.

Which vehicles will these coils and plugs fit?

The kit is built to match the OE fitment for a range of Nissan and Infiniti V6 engines across model years listed by the manufacturer. It covers popular platforms like the Altima, Maxima, 350Z, Frontier, Pathfinder, Xterra and several Infiniti models; always verify compatibility with your VIN or the product photos before purchasing.

• Common Nissan fits: 2002–2006 Altima 3.5L, 2002–2008 Maxima 3.5L, 2003–2006 350Z 3.5L.
• Truck and van fits: 2005–2019 Frontier 4.0L, NV1500/NV2500/NV3500 4.0L.
• Infiniti fits: 2003–2008 FX35 3.5L, 2003–2007 G35 3.5L, 2006–2008 M35 3.5L.
• Refer to the product gallery for the full vehicle list to confirm fitment before ordering.

How do these parts improve ignition performance?

The ignition coils are manufactured from high-quality materials and include an internal ferrite noise suppressor to minimize radio-frequency interference while ensuring reliable high-voltage transfer. The double-iridium spark plugs are formulated for long service life and stable, consistent sparks that help maintain smoother running between changes.

• Double iridium electrodes deliver long life—rated up to approximately 100,000 kilometers under normal conditions.
• Thermoplastic coil connectors resist heat-related cracking and provide a secure electrical connection.
• Stainless-steel springs inside the coil ensure strong contact and consistent conduction to the plug.
• Each coil approximates OEM dimensions for quick, bolt-in replacement with standard tools.

What symptoms indicate you should replace the coils and plugs?

Signs that this kit may be needed include intermittent or constant engine misfires, a rough or uneven idle, loss of acceleration, or a noticeable drop in fuel economy. Replacing both coils and plugs as a set helps restore balanced firing across cylinders and often resolves performance irregularities caused by worn ignition components.

• Engine misfire codes or check-engine light illumination.
• Rough idle, hesitation, or stalling under load.
• Decreased fuel efficiency compared to normal operation.
• Visible wear or gap growth on removed spark plugs during inspection.

How straightforward is installation, and what comes in the box?

Installation is a typical direct-swap procedure for coil-on-plug V6 engines and generally requires only basic hand tools. The package contains six ignition coil packs and six double-iridium spark plugs; no manual is included, so consult a repair guide or service manual for torque specs and step-by-step instructions if needed.

• Included: Ignition Coil Packs x6 and Double Iridium Spark Plugs x6.
• Not included: installation instructions—use OEM torque specs and safety precautions.
• OE cross-reference numbers provided for verification before installation.
• Manufacturer provides 24-hour customer service and a 1-year product warranty.

Who is this for? This X4XZ kit is aimed at DIY mechanics, independent repair shops, and vehicle owners seeking a cost-effective, OE-replacement option for V6 Nissan and Infiniti models that use the 22448-AL61C family of ignition components. Choose this set when you want matched coils and long-life iridium plugs to address misfires, improve drivability, and reduce follow-up maintenance frequency; confirm vehicle compatibility before purchase to ensure a correct fit.