MSD 5574 Street Fire Spark Plug Wire Set GM LS Truck 4.8L 5.3L 6.0L

The MSD 5574 Street Fire Spark Plug Wire Set is a direct-fit, performance-grade ignition wire set engineered specifically for GM LS-series truck and SUV engines. Custom-engineered wire lengths ensure a precise fit for Gen III LS applications, and the set is compatible with both round and square LS-style coil packs — no modifications required.

At the heart of the Street Fire wire is a helically wound, low-resistance conductor rated at 500 ohms per foot, delivering a strong, consistent spark from coil to plug. The spiral-wound design also effectively suppresses electromagnetic interference (EMI) and radio frequency interference (RFI), protecting sensitive electronics from ignition noise.

Key Features:

• 8mm diameter silicone and synthetic outer jacket resists heat, abrasion, and engine chemicals
• Helically wound Aramid (Kevlar) core provides exceptional strength and long-term durability
• 500 ohms/ft low-resistance conductor for improved spark energy and power delivery
• Heavy-duty coil pack terminals with factory-style boots for a secure, rattle-free connection
• Black silicone boots protect terminals from extreme exhaust heat
• Fits both round and square LS-style coils — no adapters needed
• Assembled set — ready to install out of the box
• Emissions legal for street use
• Backed by MSD's 1-year limited warranty

The MSD Street Fire series delivers a meaningful performance upgrade over stock wiring at an accessible price point, making it an ideal choice for daily drivers, weekend trucks, and mild performance builds alike.