KacuYelin UF349 Ignition Coil Pack & Iridium Spark Plugs Set of 6 — 3.5L/4.0L V6 Fit, OEM-Style Durable Performance

This plug-and-play kit pairs German-grade coil packs with long-life iridium spark plugs to replace worn ignition components on many 3.5L and 4.0L V6 Nissan, Infiniti and related models. Each coil uses high-purity copper windings, a silicon steel core and heat-resistant epoxy for consistent high-voltage delivery. The iridium plugs employ a precision laser-welded center electrode and robust ceramic insulators to resist wear and carbon buildup.

Which vehicles will this set fit?

This set is designed for a range of Nissan, Infiniti and compatible vehicles using the 3.5L or 4.0L V6 engines. Always confirm fitment by matching your car’s year, make, model and engine to ensure correct compatibility before purchase.

• Infiniti I35 (2002–2004), QX4 (2001–2003 post 07/01)
• Nissan Altima (2002–2006 3.5L), Maxima (2002–2008), Murano (2003–2008)
• Frontier (2005–2019 4.0L), Xterra (2005–2015 4.0L), Pathfinder (2001–2012 variants)
• Quest (2004–2009), NV1500/2500/3500 (2012–2019 4.0L), Suzuki Equator (2009–2012)

How do the coil packs and plugs improve engine performance?

The coils deliver steady, high-voltage output while the iridium spark plugs provide a concentrated spark and improved durability. Together they reduce misfires and uneven idle, helping the engine run more smoothly and predictably under normal driving conditions.

• Coils: corrosion-resistant materials and premium windings for stable voltage
• Plugs: 360° laser-welded iridium electrode for focused ignition
• Combined: fewer ignition faults and steadier combustion cycle

What are the build quality and materials used?

KacuYelin sources components and manufactures these parts in TS16949-quality production environments. The coils use high-purity copper windings, silicon steel cores and high-temperature epoxy, while the spark plugs feature high-alumina ceramic insulators and nickel-alloy shells for rust resistance.

• Coil construction: anti-oxidation coatings and corrosion-resistant components
• Spark plugs: up to 90% nickel content and 95% alumina ceramic for insulation
• Manufacturing standard: produced in TS16949-certified facilities

Are these parts easy to install and what should I check before buying?

Yes — the kit is designed to match OEM specifications for direct replacement and generally installs with basic hand tools. Before ordering, verify your vehicle’s exact year, model, engine displacement and aspiration so the parts align with the original OEM fit.

• Plug-and-play design matches OEM specifications for direct swap
• Confirm year, make, model, engine size in the seller’s fitment tool
• If unsure, compare OEM part numbers like UF349 or 224488J115

Who is this for? This KacuYelin ignition kit is aimed at owners and technicians maintaining mid-2000s Nissan and Infiniti V6 vehicles who want a high-quality, cost-effective replacement for failing coils and worn spark plugs. It suits DIYers comfortable with basic engine work and professional shops replacing multiple ignition components at once. If your vehicle has repeated misfires, rough idle or you’re following scheduled ignition service intervals, this complete set provides matched components to restore consistent performance and help reduce ignition-related issues.