HomeIgnition > Ignition CoilWalker 900-P2101-4 Coil Boot Kit
Part #: 900-P2101-4

Walker 900-P2101-4 Coil Boot Kit

ThunderCore-Ultra
30 vehicles fit this part
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$35.84Free Shipping
Free ShippingNo Cost to Continental U.S.
Free Returns*Wrong fit? No cost
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*Free return shipping only qualifies if our fitment verification tool is used.
In Stock · Ready To Ship Most orders ship same-day if ordered before 1pm CST.
OE Direct Replacement — Bolt-on fit, no modifications needed
ThunderCore-Ultra
Fitment: Subaru and Saab, Impreza, Forester, Legacy, Outback, 9-2X, and Baja
Easy Returns — Return within 60 days for a full refund
Fast Shipping — Most orders ship same business day before 1pm CST

Overview of Walker ThunderCore-Ultra Coil Boot Kit

The Walker ThunderCore-Ultra Coil Boot Kit 900-P2101-4 is designed for reliable ignition performance in select Saab and Subaru vehicles. This coil boot kit ensures proper electrical insulation and connection between the ignition coil and spark plug, supporting efficient engine operation.

  • Compatible with Saab 9-2X and Subaru models including Baja, Forester, Impreza, Legacy, and Outback
  • Part number 900-P2101-4 for precise identification and fitment
  • Includes coil boots engineered for optimal electrical conductivity and durability
  • Part of the Walker ThunderCore-Ultra product line, known for quality ignition components

About the ThunderCore-Ultra Product Line

The ThunderCore-Ultra line by Walker focuses on ignition components that meet stringent performance standards. This product line emphasizes durability and consistent electrical performance, making it suitable for coil boot kits like the 900-P2101-4. The ThunderCore-Ultra series supports reliable ignition system function in vehicles such as the Saab 9-2X and Subaru Forester, ensuring stable spark delivery under various driving conditions.

Product Description and Application

The Walker 900-P2101-4 coil boot kit is engineered to provide a secure and insulated connection between the ignition coil and spark plug. This connection is critical for maintaining proper spark timing and preventing misfires. Designed specifically for Saab 9-2X and Subaru models including Baja, Forester, Impreza, Legacy, and Outback, this coil boot kit helps maintain engine efficiency and performance by ensuring consistent ignition coil operation.

Common Issues Addressed by This Coil Boot Kit

  • Ignition misfires caused by worn or damaged coil boots
  • Electrical arcing or shorts in the ignition system
  • Reduced engine performance due to poor spark delivery
  • Difficulty starting the engine related to ignition coil connection
  • Increased emissions from incomplete combustion

Installation Notes and Tips

  • Ensure the engine is cool before beginning installation to avoid burns
  • Disconnect the battery to prevent electrical shock during replacement
  • Carefully remove old coil boots without damaging ignition coils or spark plugs
  • Apply dielectric grease to the inside of the new coil boots to improve electrical contact and ease future removal
  • Verify secure fitment of the coil boots to prevent moisture intrusion and maintain ignition integrity

Quality Assurance and Warranty

Walker provides quality assurance for the ThunderCore-Ultra coil boot kit 900-P2101-4, manufactured to meet OEM specifications for Saab and Subaru vehicles. While specific warranty details should be confirmed at the point of purchase, Walker products typically come with a limited warranty covering defects in materials and workmanship to ensure reliability and customer confidence.

This part fits 30 vehicles. Search below:

YearMakeModelLitersCylindersPositionNotes
2014SubaruImpreza2.5LH4N/AThunderCore-Ultra
2013SubaruImpreza2.5LH4N/AThunderCore-Ultra
2012SubaruImpreza2.5LH4N/AThunderCore-Ultra
2011SubaruImpreza2.5LH4N/AThunderCore-Ultra
2010SubaruForester2.5LH4N/AThunderCore-Ultra
2010SubaruImpreza2.5LH4N/AThunderCore-Ultra
2009SubaruForester2.5LH4N/AThunderCore-Ultra
2009SubaruImpreza2.5LH4N/AThunderCore-Ultra
2009SubaruLegacy2.5LH4N/AThunderCore-Ultra
2009SubaruOutback2.5LH4N/AThunderCore-Ultra
2008SubaruForester2.5LH4N/AThunderCore-Ultra
2008SubaruImpreza2.5LH4N/AThunderCore-Ultra
2008SubaruLegacy2.5LH4N/AThunderCore-Ultra
2008SubaruOutback2.5LH4N/AThunderCore-Ultra
2007SubaruForester2.5LH4N/AThunderCore-Ultra
2007SubaruImpreza2.5LH4N/AThunderCore-Ultra
2007SubaruLegacy2.5LH4N/AThunderCore-Ultra
2007SubaruOutback2.5LH4N/AThunderCore-Ultra
2006Saab9-2X2.5LH4N/AThunderCore-Ultra
2006SubaruBaja2.5LH4N/AThunderCore-Ultra
2006SubaruForester2.5LH4N/AThunderCore-Ultra
2006SubaruImpreza2.5LH4N/AThunderCore-Ultra
2006SubaruLegacy2.5LH4N/AThunderCore-Ultra
2006SubaruOutback2.5LH4N/AThunderCore-Ultra
2005SubaruBaja2.5LH4N/AThunderCore-Ultra
2005SubaruForester2.5LH4N/AThunderCore-Ultra
2005SubaruLegacy2.5LH4N/AThunderCore-Ultra
2005SubaruOutback2.5LH4N/AThunderCore-Ultra
2004SubaruBaja2.5LH4N/AThunderCore-Ultra
2004SubaruForester2.5LH4N/AThunderCore-Ultra

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.