IFATRUNK Iridium Spark Plugs 6-Pack for Nissan/Infiniti/Toyota V6 2.7L–4.0L — Laser-Welded Iridium Tip, OE Fit

If your V6 is running rough, using more fuel, or you’re following a scheduled tune-up, swapping in a set of high-grade iridium plugs can reduce misfires and improve throttle response. This 6-pack matches OE thread and heat-range references (replaces 4469, LFR5AIX11 and related numbers) and suits a wide range of 2.7L–4.0L engines from Nissan, Infiniti, Toyota, Kia and Hyundai. Each plug uses a laser-welded iridium center electrode engineered for narrower diameter, more focused spark and better wear resistance than conventional electrodes.

Which vehicles and engines will these plugs fit?

These plugs are intended as direct-fit replacements for many V6 models built in the 2000s and 2010s. Compatibility covers multiple Nissan/Infiniti V6 platforms (3.5L and 4.0L) and selected Toyota, Kia and Hyundai V6 engines listed by year and displacement.

• 2003–2006 Nissan 350Z 3.5L, 2002–2006 Altima 3.5L, 2002–2008 Maxima 3.5L
• 2005–2019 Nissan Frontier 4.0L, 2005–2012 Pathfinder 4.0L, 2005–2015 Xterra 4.0L
• Infiniti G35/FX35/M35/I35 models with 3.5L V6 where specified
• Selected Toyota 4Runner and Tundra 4.0L, Kia Optima/Rondo 2.7L, Hyundai Santa Fe/Genesis variants

How does iridium construction affect performance and durability?

Iridium is used for a finer center electrode diameter, which concentrates spark energy and helps ensure more consistent ignition across conditions. The laser-welded iridium tip resists thermal and electrical erosion better than traditional nickel tips, extending service intervals under typical driving.

• 0.4–0.6 mm iridium center for a precise, strong spark
• Laser-welded joint to resist electrode wear and fouling
• Improved cold starts, stable idling and steadier high-rpm ignition

What should I expect when I install these plugs?

After proper installation and gap verification, expect smoother idle, crisper throttle response and fewer misfires compared with worn plugs. Fuel efficiency gains are possible when plugs restore efficient combustion, though exact results depend on engine condition and driving style.

• Replace in sets of six for consistent cylinder performance
• Verify gap and torque to OEM specs before final tightening
• Pair with fresh ignition coils/wires when diagnosing persistent issues

Are these plugs easy to install at home?

Yes — installation is straightforward for anyone comfortable with basic engine maintenance, but follow safety and torque guidelines. Use a torque wrench and the correct socket, and check the vehicle service manual for gap/tightening values and removal sequence.

• Hand-tighten then torque to manufacturer recommendation
• Inspect threads and apply anti-seize only if manufacturer permits
• Replace coils or boots if they show wear to avoid cross-fire

Who this is for: This IFATRUNK 6-pack is aimed at DIY mechanics and professional technicians working on mid-2000s to 2010s V6 Nissan and Infiniti vehicles, plus select Toyota, Kia and Hyundai V6 models. Choose these plugs if you want a cost-effective iridium upgrade that matches common OE references (4469, LFR5AIX11 and equivalents) and delivers long-lasting spark performance for routine tune-ups and repairs.