Ultra 40 Race Wire 100ft Spool

The Ultra 40 Race Wire 100ft Spool by MOROSO is a professional-grade ignition wire designed for high-performance and racing applications where reliable spark delivery under extreme conditions is non-negotiable. Built for serious engine builders, drag racers, and street performance enthusiasts, this wire handles the demands of heavily modified engines, supercharged builds, and high-RPM competition use.

MOROSO's Ultra 40 Race Wire features spiral-wound construction that minimizes EMI (electromagnetic interference) while maintaining low resistance per foot—critical for preserving spark energy across long plug wire runs in modern engine bays. The core is engineered to withstand sustained high-temperature environments near exhaust manifolds and turbochargers, with insulation rated for both thermal stress and chemical exposure from oils and fuel systems.

This spool format works best for custom engine builds, race team setups, and fabricators who need consistent, high-spec wire for multiple vehicles or restoration projects. Installation is straightforward—cut to length, install proper terminals, and route away from heat sources to ensure optimal performance.