Set of 6 UF349 Ignition Coil Packs and 22401-8H515 Spark Plugs

In this review of the SYKRSS ignition coil and spark plug kit, the bottom line is simple: this set is aimed at owners of early 2000s Infiniti and Nissan V6 models who need a complete ignition service solution that balances reliability and value. The reviewer found the package of six coil packs and six iridium spark plugs addresses common ignition symptoms - misfire, rough idle, and poor fuel economy - by replacing worn components with parts that meet or exceed original equipment form and function. It is a pragmatic choice for DIY mechanics and independent shops looking for a full-cylinder replacement rather than piecemeal repairs.

Key Features

• Multivehicle fit: Covers many Infiniti and Nissan 3.5L and 4.0L V6 applications, allowing one kit to service a full cylinder bank across several models and years.
• Durable coil construction: Coil packs use silicon steel, high-pressure rubber sleeves and Japan-imported epoxy to resist cracking and shorting, improving long-term reliability.
• Quality windings: Germany-imported venameled wire is used in the coils to maintain stable high-voltage output across engine speeds.
• Iridium spark plugs: Fine iridium electrodes and isostatic ceramic insulators deliver quicker ignition, better startup and reduced plug wear compared with older designs.
• OE-equivalent performance: Both coils and plugs are produced to meet or exceed OE specifications for fit and function, simplifying replacement and installation.
• Complete kit and support: Includes six coils, six spark plugs and a manual, plus a 24-month customer service window for post-sale support.

Who It's For

This kit is best for owners of 2001-2006 Infiniti I35 or QX4 and compatible Nissan Altima, Maxima, Murano, Pathfinder, Frontier, Quest and Xterra models with 3.5L or 4.0L V6 engines who want to replace all ignition coils and plugs at once. It is also suited to DIY mechanics and independent repair shops that prefer buying full sets to ensure matched components across cylinders.

Those who should look elsewhere include owners of different engine sizes or later-model vehicles outside the listed years, and anyone who only needs a single coil or individual plug replacement rather than a full six-pack kit.

Pros & Cons

Pros

• High-quality materials in coils and plugs aim to reduce failures like cracking or short-circuiting.
• Iridium plugs improve ignition performance, starting and acceleration compared with worn plugs.
• One kit services a full bank of cylinders for many Infiniti and Nissan V6 models, offering good value for money.

Cons

• Fitment is specific to the listed models and years, so buyers must verify compatibility before ordering.

Specifications

Our Verdict

This SYKRSS six-pack kit is a sensible, cost-effective option for owners of compatible Infiniti and Nissan V6 vehicles who need a complete ignition refresh. The combination of robust coil construction and iridium plugs addresses common ignition faults and delivers reliable, OE-equivalent performance while keeping parts matched across cylinders, making it a strong value for DIYers and independent shops.

Frequently Asked Questions

Will this kit fit my vehicle?
Check the compatible models and years listed on the product detail picture and page; fitment is specific to certain 3.5L and 4.0L V6 Infiniti and Nissan vehicles.

Are the spark plugs iridium?
Yes, the spark plugs use fine iridium electrodes for improved ignition and longer life.

What comes in the box?
The package includes six ignition coils, six spark plugs and one manual, plus access to 24-month customer support.