Keep high-voltage spark flowing cleanly to every cylinder with the ThunderCore PRO ThunderSpark Coil Boot Kit 900-P2114-6. It installs as a direct-fit replacement for the 1999-2001 Nissan Maxima — see the Buyer's Guide tab for engine-specific coverage. In coil-on-plug (COP) and coil-near-plug (CNP) systems, the coil boot forms the insulative path between the ignition coil and the spark plug; over time heat, vibration, and chemical exposure can degrade a boot, and if a cracked or arced-through boot is the cause of your misfire or hard starting, this kit replaces the worn parts.
Engineered to match OE dielectric strength, boot length, and connector geometry for consistent high-voltage insulation and secure coil-to-plug contact.
Interchange: CPBK400 · SPP77E · SPP78E
This part cross-references / interchanges with the following part numbers:
What vehicles does this coil boot kit fit?
It is a direct-fit replacement for the 1999-2001 Nissan Maxima. Check the Buyer's Guide tab to confirm engine-specific coverage for your vehicle.
What is included in the kit?
The Coil Boot Kit includes the boots, springs, and insulators needed for full-cylinder service, making it suitable for a tune-up or preventative maintenance.
What does a coil boot do?
In coil-on-plug and coil-near-plug systems, the coil boot serves as the insulative path between the ignition coil and the spark plug, maintaining high-voltage isolation.
What are signs the coil boots may need replacing?
Boots can degrade from heat, vibration, or chemical exposure, which may lead to arc-through, misfires, or hard starting. Diagnose the cause before replacing.
What material are the boots made from?
Each boot is constructed from high-temp silicone and reinforced materials to resist oil, fuel, and under-hood heat.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
