Restore clean, insulated spark delivery with the ThunderCore PRO ThunderSpark Coil Boot Kit 900-P2021-5 (also written 900P20215), an OE-replacement kit that renews the insulative path between the ignition coil and spark plug. It's a direct-fit replacement for the 1992-1994 Audi S4 and the 1995-1997 Audi S6. In coil-on-plug (COP) and coil-near-plug (CNP) systems, the boot carries high voltage from the coil to the plug; over time these boots degrade from heat, vibration, or chemical exposure, which can lead to arc-through, misfires, or hard starting. If a worn or cracked boot is the cause of those signs, this kit replaces it.
Designed for coil-on-plug and coil-near-plug ignition systems on the listed applications.
Interchange: 145007 · 960S
This part cross-references / interchanges with the following part numbers:
What vehicles does this coil boot kit fit?
It's a direct-fit replacement for the 1992-1994 Audi S4 and the 1995-1997 Audi S6. Check the Buyer's Guide tab to confirm fitment for your vehicle.
What is included in the kit?
The kit includes the boots, springs, and insulators needed for full-cylinder replacement, making it suited for ignition tune-ups or preventative maintenance.
What does a coil boot do?
In coil-on-plug and coil-near-plug systems, the coil boot is the insulative path between the ignition coil and the spark plug, providing high-voltage insulation and secure coil-to-plug contact.
What are signs the coil boots may need replacing?
Boots can degrade from heat, vibration, or chemical exposure, which may cause arc-through, misfires, or hard starting. Diagnose the cause before replacing, as these signs can have other sources.
What material are the boots made from?
The boots are constructed from high-temperature silicone and reinforced materials engineered 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.
