NGK Laser Iridium Spark Plug SILZKAR7B11 (4 Pack) for Subaru Legacy 2.5i Sport 2014 — 2.5L/2498cc

NGK Laser Iridium Spark Plug SILZKAR7B11 — 4 Pack for Subaru Legacy 2.5i Sport (2014)

Engineered to perform like original equipment, NGK Laser Iridium plugs pair a hard iridium tip with precise ground electrode design. The result can be more consistent ignition across a wide range of driving conditions and a longer service life compared with standard plugs.

Iridium tip is six times harder than platinum, contributing to strong ignitability and a longer interval between replacements in typical DIS ignition systems. The design often includes a platinum pad on the ground electrode to promote even wear, helping the plug maintain reliable performance over time.

In the Subaru 2.5L 4-cylinder lineup, this plug is OE-engineered to fit the 18 mm thread, gasket seat, and 1.040 in reach. The copper core helps pull heat away from the tip, while a pure alumina silicate ceramic insulator maintains strength under higher engine temperatures. Three seals add resistance to leakage and contamination, helping maintain steady performance even after miles of operation.

What you get in a 4-pack

This kit delivers four identical units, ideal for a full tune-up or replacing plugs across multiple cylinders at once. Key design points aimed at reliability include:

• Trivalent metal plating for corrosion resistance and easier removal
• Corrugated ribs that reduce flashover risk in challenging ignition environments
• Extended projected insulator for durability and effective heat transfer
• Ground electrode with a platinum pad for even wear in DIS ignition systems
• Resistor inside for EMI suppression

Real-world benefits to expect

Results depend on your vehicle and driving style, but you may experience smoother idle, easier cold starts, and steadier acceleration from a refreshed spark system. The 4-pack is designed to fit common Subaru configurations and helps streamline installation for maintenance or repairs.

Why NGK for your Subaru

As an OE-engineered option, NGK emphasizes reliability and compatibility with Subaru engines. The Laser Iridium family aims for longevity and consistent performance across many miles, with design choices that support efficient combustion and engine protection.