KacuYelin Ignition Coil Pack and Iridium Spark Plug Set, Set of 6 — Direct-Fit for 3.5L Engines

KacuYelin’s UF550 ignition coil pack bundled with six iridium spark plugs is a direct-fit replacement set engineered to restore reliable spark delivery and consistent combustion for many Infiniti and Nissan 3.5L engines.

This kit combines precision-engineered ignition coils with long-life iridium plugs to address misfires, hard starts, and uneven idling by rebuilding the ignition system from coil to plug. Each coil uses high-purity copper windings and heat-resistant materials for stable high-voltage output, while the iridium plugs feature laser-welded electrodes and high-grade ceramics for focused sparks and extended service life. The set is made by KacuYelin in TS16949-capable facilities and is supplied as a plug-and-play replacement for common OE part numbers like UF550, C1670, and 22448-JA10C.

Which vehicles will this ignition coil and spark plug set fit?

This package is tailored for several Infiniti and Nissan models with 3.5L engines across model years roughly 2007–2020. Compatibility covers popular sedans, crossovers, and sports models; verify year, model, and engine before purchase for an exact match.

• Infiniti: EX35, FX35, G25/G35, JX35, M35/M35h, Q50, Q70, QX60 (various years)
• Nissan: 350Z, Altima, Maxima, Murano, Pathfinder, Quest (3.5L models across listed years)
• OE references included: UF550, C1670, 22448-JA10C and related numbers for cross-checking

How do the coils and plugs improve engine performance?

The coils deliver consistent high-voltage pulses thanks to premium copper windings and a silicon-steel core, while plugs use iridium tips and 95% alumina ceramics to focus spark energy. Together they tighten ignition timing consistency, reduce misfires, and help the engine burn fuel more efficiently without altering factory settings.

• More concentrated sparks from 360° laser-welded iridium electrodes
• Improved voltage stability from corrosion-resistant coil materials
• Cleaner combustion, reduced carbon build-up and steadier idle

How long will the iridium spark plugs and coils last?

Iridium plugs are designed for long service life; typical durable performance ranges between 60,000 and 100,000 miles depending on driving conditions. Coils built with high-temperature epoxy and anti-oxidation materials resist degradation, but lifespan can vary with heat cycling and engine conditions—inspect during routine maintenance.

• Plugs: engineered for 60,000–100,000 miles under normal use
• Coils: heat-resistant construction for prolonged service life
• Recommended: replace coils and plugs together for optimal reliability

Is installation difficult and what should I check before buying?

Installation is intended to be plug-and-play—coils and plugs match OEM dimensions and electrical connections—but basic mechanical skill and common hand tools are necessary. Always confirm vehicle year, submodel, engine displacement, and aspiration in the seller’s fitment checker to ensure exact compatibility.

• Direct-fit design follows OEM specs for straightforward replacement
• Verify year, make, model, and engine before ordering
• Torque spark plugs to manufacturer specs and inspect coil connectors

Who is this for: This KacuYelin UF550 coil and 6-plug kit is aimed at owners and technicians of Infiniti and Nissan 3.5L vehicles seeking a reliable, OEM-compatible ignition refresh. It’s suited for those troubleshooting misfires, restoring lost power or fuel efficiency, or performing scheduled ignition maintenance who want long-life iridium plugs and robust coil construction in one purchase.