Key Features
Custom-Length LS Wire Set
Unlike universal wire kits, the Street Fire 5574 uses application-specific wire lengths designed for GM truck engines.
Benefits include:
- Cleaner engine bay routing
- OEM-style appearance
- Easier installation
- Reduced wire clutter
Correct wire length also minimizes unnecessary contact with hot engine components.
8mm High-Temperature Silicone Construction
The ignition wires use durable 8mm silicone insulation to withstand demanding underhood conditions.
Advantages include:
- High heat resistance
- Oil resistance
- Moisture protection
- Long-lasting flexibility
- Improved electrical insulation
The silicone jacket helps prevent voltage leakage caused by aging factory wires.
Helically Wound Kevlar® Core
Each wire features a Kevlar®-reinforced helically wound conductor.
Benefits include:
- Excellent spark transfer
- Increased tensile strength
- Reduced electrical interference
- Long service life
The Kevlar core adds durability while maintaining consistent ignition performance.
500 Ohms Per Foot Resistance
MSD engineered the Street Fire series with approximately 500 ohms of resistance per foot, balancing ignition performance and electrical noise suppression.
Advantages include:
- Reliable spark delivery
- Stable ignition timing
- Effective EMI suppression
- Improved combustion efficiency
Proper resistance helps maximize ignition performance while protecting sensitive vehicle electronics.
Heavy-Duty Coil & Plug Terminals
The wire set uses heavy-duty terminals that provide secure engagement with both ignition coils and spark plugs.
Benefits include:
- Reliable electrical contact
- Improved spark retention
- Easy installation
- Reduced vibration-related failures
Strong terminal retention is especially valuable in trucks that tow or see off-road use.
Built for Daily Drivers & Performance Trucks
The Street Fire 5574 is well suited for:
- Daily-driven pickups
- Tow vehicles
- Fleet trucks
- Weekend performance builds
- Mild LS upgrades
- Engine swaps
It offers dependable performance without the premium price tag of race-only ignition systems.
Common Symptoms of Worn Spark Plug Wires
If your LS-powered truck is experiencing:
- Rough idle
- Engine hesitation
- Misfires
- Hard starting
- Reduced fuel economy
- Check Engine Light
Replacing worn ignition wires can often restore smooth engine operation and reliable spark delivery.
Installation Tips
For best results:
- Replace one wire at a time.
- Follow the factory wire routing.
- Fully seat both coil and spark plug boots.
- Keep wires away from exhaust manifolds.
- Inspect spark plugs during installation and replace them if needed.
Proper installation helps maximize wire life and ignition performance.
Warranty Coverage
MSD backs the Street Fire 5574 with a one-year manufacturer warranty, providing additional confidence for everyday drivers and performance enthusiasts alike.
Final Verdict
The MSD Street Fire 5574 Spark Plug Wire Set is one of the best values for 1999–2014 GM LS trucks and SUVs. Combining custom-fit wire lengths, durable 8mm silicone construction, a Kevlar®-reinforced helical core, and compatibility with both UF262 round and UF271 square ignition coils, it delivers reliable ignition performance at an attractive price.
For Silverado, Sierra, Tahoe, Yukon, Avalanche, and Suburban owners looking for an affordable ignition upgrade backed by one of the most trusted names in performance ignition, the Street Fire 5574 is an excellent choice.
Frequently Asked Questions
Does the Street Fire 5574 fit both round and square LS coils?
Yes. The wire set is designed to work with both UF262 round-body and UF271 square-body LS ignition coils used on GM trucks.
What is the advantage of a Kevlar® core?
Kevlar reinforcement increases wire strength, improves durability, and helps maintain consistent ignition performance under heat and vibration.
Is 500 ohms per foot good for ignition wires?
Yes. Approximately 500 ohms per foot provides an excellent balance between strong spark delivery and effective EMI suppression for modern electronic ignition systems.
Is this a direct-fit wire set?
Yes. The MSD Street Fire 5574 uses application-specific wire lengths for compatible 1999–2014 GM LS truck and SUV engines.
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