Moroso 73669 Ultra Custom Fit Spark Plug Wire Set - 40

The Moroso 73669 Ultra 40 Custom Fit Spark Plug Wire Set delivers professional-grade ignition performance for high-output engines. Built with a 40mm spiral-wound ferrite-impregnated core and a Kevlar center core, these wires provide excellent suppression of electromagnetic interference (EMI) and radio frequency interference (RFI) while maintaining maximum energy transfer to the spark plugs.

A conductive polymer coating surrounds the core, working in conjunction with the nickel-copper alloy conductor to ensure consistent, low-resistance spark delivery under demanding conditions. The multi-layer construction is finished with a high-temperature silicone jacket rated to withstand extreme under-hood heat, protecting wire integrity in tight engine bays and near headers or exhaust components.

Key Features:

• Locking stainless steel terminals — provide a secure, corrosion-resistant connection that won't back out under vibration
• High-temperature silicone boots — resist heat, ozone, and chemical exposure for long service life
• Fold-over crimping construction — ensures a gas-tight, mechanically strong terminal connection
• Silicone jacket — protects against extreme heat, abrasion, and fluid contamination
• Nickel-copper alloy conductor — delivers reliable conductivity and corrosion resistance
• Ferrite-impregnated spiral core — suppresses EMI/RFI for clean ignition signal and on-board electronics compatibility
• Kevlar center core — adds tensile strength to prevent stretching or breakage during installation and removal
• Conductive polymer coating — enhances overall wire performance and signal consistency

Moroso Ultra 40 wires are a trusted choice for performance street builds, racing applications, and engine builders who demand durability and consistent ignition performance. The custom-fit design ensures a clean, precise installation specific to your application.