Ignition Coil Pack and Iridium Spark Plugs 6PCS UF550 Set - Reliable

In this review the 6PCS UF550 ignition coil pack with 6 iridium spark plugs is evaluated for drivers of several Nissan and Infiniti models who need a full ignition service kit. The bottom line: this aftermarket set offers a straightforward, cost-effective way to restore ignition performance because it pairs OE-equivalent coils (listed as UF550 and several cross numbers) with iridium plugs that improve starting and smoothness. Installation is simple for anyone comfortable with basic engine work and the pack addresses the common symptoms of worn coils: misfires and rough idle.

Key Features

• OE Cross Numbers: The coils list multiple replacement numbers so buyers can confirm fit against dealer references before purchase.
• Complete 6-Pack: Supplying six coils and six iridium plugs lets owners service an entire bank without sourcing parts separately, saving time and effort.
• High Performance Materials: Built with premium materials and modern coil technology to provide stable spark energy under a range of operating conditions.
• Direct Fit Threads: Thread diameter M12 and thread length 26.5 mm match the original dimensions to enable direct installation without modification.
• Wide Compatibility: Specified for 2.5L and 3.5L engines used in QX60, Altima, Maxima, Murano and related models so it covers common replacement needs for those vehicles.
• Easy Installation: The connector and coil size match the original, so swapping the coils is possible with basic hand tools and no special adapters.

Who It's For

This kit is best for owners of compatible Nissan and Infiniti models with 2.5L or 3.5L engines who want a full ignition refresh in one purchase. It suits DIY mechanics who prefer replacing all coils and plugs at once to eliminate intermittent misfires and restore engine smoothness.

Those who should look elsewhere include owners of models not listed among the compatible vehicles and buyers who require OEM-brand certification or dealer-only numbered parts; also verify the model year and engine before ordering to avoid fitment surprises.

Pros & Cons

Pros

• Good value: six coils plus six iridium plugs cover a whole bank for one purchase.
• Reported improvement in engine smoothness and starting from customers after installation.
• Direct-fit thread and connector dimensions reduce installation time and complexity.

Cons

• Some users reported fitment uncertainty for specific older or non-listed models, so double-check compatibility before buying.

Specifications

Contents	6 ignition coils + 6 iridium spark plugs
Replace Part Numbers	UF550, C1670, 22448-JA10C and others
Thread Diameter	M12 / 0.47 in
Thread Length	26.5 mm / 1.04 in
Compatible Engines	2.5L and 3.5L applications
Compatible Models	QX60, JX35, EX35, FX35, G25, M35, G35, Maxima, Murano, Pathfinder, Altima, Quest, 350Z

Our Verdict

The 6PCS UF550 coil pack and iridium spark plug kit is a practical, economical choice for owners of compatible Nissan and Infiniti 2.5L and 3.5L engines who need a full ignition replacement. It delivers reliable performance, easy direct-fit installation, and clear value by combining coils and plugs; just confirm the exact model fitment before purchase to avoid compatibility issues.

Frequently Asked Questions

Will these coils fit my vehicle?
Check the listed replacement numbers and confirmed compatible models against your vehicle VIN or service manual; compatibility covers many 2.5L and 3.5L Nissan and Infiniti models.

Are the spark plugs pre-gapped?
The package contains iridium spark plugs intended for direct fit; always verify and adjust the gap if needed for your engine before installation.

Do I need special tools to install them?
No special tools are required; the coils and connector match the original and installation can be done with basic hand tools.