Standard Wires 55504 Spark Plug Wire Set

Ignition Wire Set for Subaru and Saab Applications

Standard Wires 55504 is a spark plug wire set built for select Subaru and Saab applications, including 2005-2011 Subaru Impreza, 2005-2010 Subaru Forester, 2006-2009 Subaru Legacy, 2006-2009 Subaru Outback, and 2005-2006 Saab 9-2X. It uses a hi-gloss clear coat over a high-temperature silicone jacket to improve abrasion resistance and heat protection.

The 55504 part number is engineered with an OE-matched wire core design to help deliver voltage efficiently to the spark plugs while improving radio-frequency interference control. Standard Wires 55504 is a direct-fit ignition wire set for buyers searching for a Subaru Impreza spark plug wire set or Subaru Forester ignition wire replacement.

Key Features

• Patented clear-coat exterior with a high-temperature silicone jacket
• OE-type core design matched to low-ohm, ferrite mag, wire-wound, silicone, or metallic configurations
• Improved abrasion resistance for demanding engine-bay conditions
• Heat protection for severe temperature exposure
• Supports strong voltage transfer to the spark plugs
• Enhanced RFI suppression for cleaner ignition performance

Detailed Description

Standard Wires 55504 is a replacement spark plug wire set for Subaru and Saab vehicles that require OE-style ignition wire construction. The insulated jacket and matched core design are intended to maintain consistent spark delivery while resisting wear from heat, vibration, and routing contact points. For shoppers comparing Subaru Legacy spark plug wire set options or a Saab 9-2X ignition wire replacement, this part number provides a focused fitment match.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Misfires caused by worn or heat-damaged plug wires
• Hard starting related to weak spark transfer
• Rough idle from deteriorated ignition wire insulation
• Electrical noise from inadequate RFI protection
• Cracking, abrasion, or heat-related wire jacket damage

Installation Notes and Tips

• Verify engine layout and routing before removal of the original wires.
• Match each lead to the correct cylinder and coil/distributor connection.
• Inspect boots, terminals, and nearby ignition components during service.
• For 2005 Subaru Legacy and 2005 Subaru Outback, confirm the application with a 90-degree boot at the distributor.

Quality Assurance

Standard Wires 55504 is built with a heat-resistant silicone jacket and an OE-matched core design to support reliable ignition wire service in Subaru Impreza, Forester, Legacy, Outback, and Saab 9-2X applications.