Insulated Plug Wire Sleeve - Ultra 40 Black

The MOROSO Insulated Plug Wire Sleeve – Ultra 40 Black is designed for engine builders and performance enthusiasts who require reliable thermal protection for ignition systems. This sleeve is particularly useful in high-output street engines, competition builds, or heavily modified platforms where plug wire degradation from heat can lead to misfires and unstable ignition timing.

Constructed from fiberglass, this insulation effectively blocks radiant and conductive heat from reaching your plug wires, preventing insulation breakdown and electrical leakage. The sleeve's design allows it to slip over existing wires without the need for rewiring or modifications, ensuring a straightforward installation for both OEM and custom setups.

Engine tuners, drag racers, and street rodders will find this product particularly beneficial, as it helps maintain spark integrity across the entire RPM range. By preserving existing plug wire routing and connections, this sleeve adds a protective barrier that extends component lifespan, making it an essential accessory for performance applications.