BDFHYK Ignition Coil Pack & Iridium Spark Plugs Kit for 3.5L V6 — Set of 6, UF401/4469 Compatibility

BDFHYK UF401 ignition coil pack and iridium spark plug 4469 kit replaces OEM coil and plugs for Nissan/INFINITI 3.5L V6 engines, sold as a set of 6.

This replacement kit combines six high-quality UF401 coil packs with iridium-tipped spark plugs (OE reference 4469 / LFR5AIX-11) engineered to fit 3.5L V6 Nissan and INFINITI models including 350Z, G35, FX35 and M35 from the early 2000s. Parts are built using improved electrical windings, durable rubber boots, and iridium electrodes to restore consistent ignition, reduce misfires, and extend service intervals versus worn factory components. Always verify OEM part numbers and fitment photos before ordering to ensure compatibility with your vehicle.

How will these coils and plugs affect engine starting and idle?

Replacing worn ignition coils and plugs helps restore a steady spark, which improves cold starts and smooths idle irregularities. The iridium spark plugs require less voltage for a strong spark, while the coils’ upgraded materials stabilize current delivery under load.

• Faster engine starts with stronger, more consistent sparks.
• Smoother idle and fewer misfires at low RPM.
• Reduced stumbling during warm-up and light load driving.

Will these parts fit my vehicle and how do I confirm compatibility?

This set is designed for 3.5L V6 applications: INFINITI FX35 (2003–2008), G35 (2003–2007), M35 (2006–2008) and Nissan 350Z (2003–2006). You should cross-check your existing OEM numbers and compare the part photos before purchase to avoid fitment issues.

• Check OE references: UF401, 22448-AL61C, 22448-AL615 and spark plug 4469/LFR5AIX-11.
• Compare connector shape, mounting tabs, and coil boot length with your originals.
• Contact seller or consult vehicle parts diagram for model-year variations.

What materials and design features improve durability and performance?

BDFHYK coils use silicon steel cores, varnished copper windings, and high-grade rubber boots to resist heat and vibration. The spark plugs use an iridium center electrode and robust ceramic insulators for a long service life and consistent spark geometry.

• Silicon steel and varnished wire for reduced electrical losses and heat resistance.
• Japan-imported rubber boots to prevent arcing and moisture ingress.
• Iridium electrode for precise, long-lasting spark performance.

How can I tell when my car needs new coils and spark plugs?

Common warning signs include rough idling, decreased throttle response, poor fuel economy, or a check engine light indicating misfires. If your vehicle has covered more than roughly 80,000 km (50,000 miles) or shows these symptoms, inspection and replacement are advisable.

• Engine misfire codes or illumination of the check engine light.
• Stumbling, hesitation on acceleration, or increased fuel consumption.
• Older plugs/coils showing corrosion, cracked boots, or excessive wear.

Who is this for? This BDFHYK coil and spark plug kit is aimed at owners and independent mechanics who need a complete ignition refresh for Nissan/INFINITI 3.5L V6 vehicles from the 2003–2008 era. It’s intended for drivers troubleshooting misfires or performance loss, or for anyone performing scheduled maintenance wanting longer-life iridium plugs and upgraded coil materials. Confirm OEM references and visual fitment before installation; professional installation is recommended if you’re not experienced with ignition systems.