Keep high-voltage spark traveling cleanly from the ignition coil to the plug with the ThunderCore PRO ThunderSpark Coil Boot 900-P2129 (also written 900P2129). It's an OE Replacement coil boot that restores the insulated path between the coil and spark plug in coil-on-plug (COP) and coil-near-plug (CNP) systems, and it fits a wide range of Kia, Hyundai, Genesis, Dodge and Ram vehicles — including the 2006-2016 Kia Optima, 2006-2015 Hyundai Sonata, 2007-2018 Hyundai Santa Fe, 2010-2013 Kia Forte, 2011-2018 Kia Sorento and 2012-2013 Dodge H100 Van. See the Buyer's Guide tab for the full list of applications and engines.
- OE Replacement quality: engineered to match OE dielectric strength, boot length, and connector geometry.
- Restores ignition insulation: replaces worn or cracked boots to help maintain proper spark isolation and limit voltage loss.
- Heat & chemical resistant: built from high-temperature silicone and reinforced materials to resist oil, fuel, and under-hood heat.
- COP/CNP fit: designed to match factory ignition coils and spark plugs.
Over time coil boots can degrade from heat, vibration, and chemical exposure, which may lead to arc-through, misfires, or hard starting. If a cracked or worn boot is the cause of those symptoms, replacing it helps restore proper high-voltage insulation and secure coil-to-plug contact.
Interchange: SPP176E
