NGK 55004 Spark Plug Wire Set

NGK Spark Plug Wire Set for Subaru and Saab

NGK Spark Plug Wire Set 55004 is a specific-fit ignition wire set built for Subaru and Saab applications that call for reliable spark delivery and noise suppression. It uses blue silicone insulation, a Ferro Mag core, and a 7.00 mm outside diameter to support stable ignition performance in daily driving conditions.

Key Features

• Specific-fit NGK Spark Plug Wire Set for confirmed Subaru and Saab applications
• Blue silicone insulation for heat resistance and durability
• Noise suppression design to help reduce ignition interference
• Ferro Mag core material for consistent electrical performance
• 7.00 mm insulation outside diameter
• Part number 55004, also identified as RC-FX101

Product Details

NGK 55004 is part of the NGK Spark Plug Wire Set line, a product family focused on ignition components for domestic and import vehicles. NGK draws on extensive OE experience and long-term automotive manufacturing expertise to produce replacement ignition parts that meet OE-level durability and operational standards. This wire set is engineered for direct replacement use on Subaru Impreza, Subaru Forester, Subaru Legacy, Subaru Outback, and Saab 9-2X applications listed in the fitment data. The blue silicone jacket and noise suppression construction support clean spark transfer while helping maintain ignition system performance under heat and vibration. If you are searching for NGK 55004 spark plug wires for a Subaru Impreza or Subaru Forester, this specific-fit set matches the listed applications directly.

This part cross-references DENSO Auto Parts 671-4305 for the same application.

What It Helps Address

• Misfires caused by worn or damaged ignition wires
• Hard starting related to weak spark delivery
• Ignition noise that can interfere with electrical systems
• Rough idle from inconsistent spark transfer
• Performance loss from cracked or heat-aged wire insulation

Installation Notes

Verify engine configuration and match the listed fitment before installation. Route each lead to the correct cylinder and coil connection, and inspect boots and terminals for secure seating. For 2005 Subaru Legacy and 2005 Subaru Outback applications, confirm the Federal Emission System and right-angle 90 degree coil boot requirement shown in the fitment notes. Clean surrounding ignition components before installation to help prevent contamination at the connection points.

Quality Assurance

NGK is known for ignition component manufacturing with OE-focused engineering and global automotive coverage. Part number 55004 is built as a direct replacement ignition wire set for the listed Subaru and Saab applications, with materials selected to support durability and consistent performance.