Restore reliable high-voltage insulation between the ignition coil and spark plug with the ThunderCore PRO ThunderSpark Coil Boot Kit (P/N 900-P2035-8, also written 900P20358). This OE-replacement kit fits a wide range of Chrysler, Dodge, Jeep, and RAM applications — including the 2005-2014 Chrysler 300, 2008-2015 Dodge Challenger, 2006-2015 Dodge Charger, and 2006-2015 Jeep Grand Cherokee — with many more covered; see the "Vehicles it fits" section for the full list of vehicles and engines.
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. Heat, vibration, and chemical exposure can degrade a boot over time, which may lead to arc-through, misfires, or hard starting. If worn boots are the cause, this kit replaces them.
- Heat & chemical resistant: constructed from high-temperature silicone and reinforced materials to resist oil, fuel, and under-hood heat.
- Restores ignition insulation: replaces worn or cracked boots to help maintain proper spark isolation and reduce voltage loss.
- Complete kit coverage: includes the boots, springs, and insulators needed for full-cylinder service — ideal for tune-ups and preventative maintenance.
- OE-replacement quality: designed to match OE dielectric strength, boot length, and connector geometry.
Frequently Asked Questions
What does this coil boot kit do?
It supplies the insulative boots that sit between each ignition coil and spark plug in coil-on-plug or coil-near-plug systems, providing spark isolation and secure coil-to-plug contact.
What's included in the kit?
The kit includes the boots, springs, and insulators needed for full-cylinder service, making it suited to a complete ignition tune-up or preventative maintenance.
What are signs the coil boots may need replacing?
Boots degraded by heat, vibration, or chemical exposure can arc through, which may show up as misfires or hard starting. Diagnose the cause before replacing.
What are the boots made of?
The boots are constructed from high-temperature silicone and reinforced materials designed to resist oil, fuel, and under-hood heat.
Will this fit my vehicle?
It's an OE-replacement fit for listed Chrysler, Dodge, Jeep, and RAM models such as the Chrysler 300, Dodge Charger, and Jeep Grand Cherokee. Check the "Vehicles it fits" section to confirm your exact year and model.
