Ignition Coil & Iridium Spark Plugs for Subaru Legacy Outback (2013-2014) 2.5L H4

High-Voltage Ignition Coil & Iridium Spark Plugs for 2013-2014 Subaru Outback, Legacy (FB25 / BR, BM)

Restores proper spark delivery and combustion efficiency to resolve misfires, rough idling, and poor fuel economy in aging FB25 platforms.

The Stock Outback, Legacy Ignition Degradation

The factory FB25 ignition coils degrade over time due to continuous thermal cycling and engine bay heat soak, leading to internal winding resistance failure and insulation breakdown. Additionally, standard OEM spark plug electrodes wear down over tens of thousands of miles, gradually increasing the spark gap. This widened gap places severe strain on the aging coil packs, requiring higher voltage to arc. The resulting electrical stress leads to delayed spark timing, incomplete combustion, cylinder misfires (triggering P0301-P0304 OBD-II codes), and noticeable hesitation during initial acceleration or under heavy load.

The Engineering Solution

This kit replaces the compromised OEM components with high-dielectric, epoxy-filled ignition coils specifically designed to withstand extreme engine bay temperatures without voltage leakage or primary/secondary winding failure. Paired with fine-wire iridium center electrode spark plugs, the system requires significantly less firing voltage to bridge the gap while providing a highly concentrated, powerful spark. The dense iridium alloy provides exceptional resistance to electrical erosion and thermal degradation, ensuring a consistent spark gap over an extended service interval. This precise combination stabilizes the idle, improves throttle response, eliminates misfires, and restores factory fuel economy specifications.

Technical Specifications

Compatibility

• 2013 Subaru Outback 2.5i, 2.5i Premium, 2.5i Limited (2.5L H4)
• 2014 Subaru Outback 2.5i, 2.5i Premium, 2.5i Limited (2.5L H4)
• 2013 Subaru Legacy 2.5i, 2.5i Premium, 2.5i Limited (2.5L H4)
• 2014 Subaru Legacy 2.5i, 2.5i Premium, 2.5i Limited (2.5L H4)

The Subaru Reliability Standard

Engineered to maintain Subaru's stringent durability standards, ensuring consistent power delivery to the symmetrical all-wheel-drive system and dependable starting performance in harsh winter conditions.