Coil Boot Kit for 2003-2005 Subaru Impreza - ThunderSpark 900-P2108-4

Restore proper spark insulation and secure coil-to-plug contact with the ThunderCore PRO ThunderSpark Coil Boot Kit 900-P2108-4, an OE-replacement kit for the 2003-2005 Subaru Impreza — see the Buyer's Guide tab for the engine-level applications. In coil-on-plug (COP) or coil-near-plug (CNP) systems, the coil boot forms the insulative path between the ignition coil and the spark plug. Over time these boots can degrade from heat, vibration, or chemical exposure, which can lead to arc-through, misfires, or hard starting. If worn or cracked boots are the cause, this kit replaces them.

• Complete kit coverage: includes the boots, springs, and insulators needed for full-cylinder service — ideal for ignition tune-ups or preventative maintenance.
• OE-replacement quality: engineered to match OE dielectric strength, boot length, and connector geometry.
• Restores ignition insulation: replaces worn boots to help maintain proper spark isolation and reduce voltage loss.
• Heat & chemical resistant: constructed from high-temp silicone and reinforced materials to resist oil, fuel, and under-hood heat.

Whether you're replacing a single boot or servicing an entire engine set, this kit helps restore high-voltage insulation and secure coil-to-plug contact.

Interchange: 184083 · 9008S