Denso 671-4305 Spark Plug Wire Set

Denso 7mm Ignition Wire Set for Subaru

Denso 671-4305 is a 7mm spark plug wire set built to match the form, fit, color, and performance of the original factory wiring. It uses silicone spark plug boots and OE-style terminal configurations to support consistent ignition transfer on Subaru applications.

The Denso 7mm product line focuses on direct-fit replacement parts that follow original equipment dimensions and construction standards. For buyers searching for a Subaru Impreza ignition wire set, Subaru Forester spark plug wires, or a Denso 671-4305 replacement, this part is built for the listed applications without requiring changes to the ignition layout.

• 7mm insulation outside diameter for OE-style wire routing
• Silicone spark plug boot material for heat resistance and flexibility
• 90-degree spark plug end boot design for tight engine bay routing
• Female spark plug end terminal type with male distributor/coil end terminal
• Built to meet or exceed OE/OES construction standards
• Direct replacement for Subaru ignition wire set applications

Vehicle Fitment

• Fits 2005-2011 Subaru Impreza, N/A, 7mm
• Fits 2005-2010 Subaru Forester, N/A, 7mm
• Fits 2007-2009 Subaru Legacy, N/A, 7mm
• Fits 2006-2009 Subaru Outback, N/A, 7mm
• Fits 2005-2006 Subaru Legacy, N/A, Except California; 7mm
• Fits 2005 Subaru Outback, N/A, Ignition Wire Set, Except California; 7mm

Common Replacement Reasons

• Engine misfire caused by worn ignition wires
• Hard starting from degraded wire insulation or boot wear
• Rough idle linked to inconsistent spark delivery
• Voltage leakage from cracked or heat-aged wire jackets
• Loss of ignition performance on Subaru Impreza, Forester, Legacy, or Outback applications

Installation Notes

Match each wire to the original routing before removal to preserve firing order and clearance around hot or moving components. Confirm the 90-degree spark plug boot orientation and the male distributor/coil end terminal type before installation. This part cross-references NGK FX101 and NAPA Mileage Plus 6714305 for the same application.

Quality Assurance

Denso First Time Fit ignition wire sets are built to OE-style specifications for form, fit, color, and performance. The 7mm construction and silicone boot materials follow the manufacturer’s OE/OES standard approach for direct replacement use on the listed Subaru vehicles.