12 Inch Extreme Race Spark Plug Wires for LS Engines
For any LS conversion where heat and signal integrity are concerns, the Extreme Race Wires 12 Inch deliver precise spark control under header heat. Each kit includes eight 12 inch spark plug wires built with an 8 mm conductor set at 25 ohm per foot and featuring RFI noise suppression to keep engine management data clean. A silicone jacket rated to 600 F resists high under hood temperatures and common fluids while molded boots at a 45 degree angle ensure accurate fit in GM LS plug wells and smooth routing around exhaust headers. These spark plug wires simplify LS engine swaps by offering reliable ignition path and exact plug placement from day one.
Rugged High-Performance Design
The Extreme Race Wires 12 Inch set is built around an 8 mm core that balances flexibility with structural strength. This high-performance wire offers a low electrical resistance of 25 ohms per foot, guaranteeing efficient energy transfer from coil to spark plug under demanding conditions. Integrated advanced RFI noise suppression keeps electromagnetic interference away from the engine control module and onboard electronics. An extreme heat silicone jacket resists temperatures up to 600 °F, preserving insulation integrity and flexibility even when positioned close to hot exhaust headers. This robust construction ensures consistent spark delivery at high RPM and extends service intervals in street and track environments.
Optimized for LS Engine Swaps
With a precise twelve inch length, these wires are engineered to simplify cable routing in tight engine bays. The angled boot design eases installation around header primaries and maintains secure retention on plug wells. Full compatibility with GM LS engine swap kits is achieved through partnership with MuscleRods, whose mounting system defines proper engine placement and drivetrain angle. This close cooperation ensures each wire aligns perfectly from coil pack to spark plug without excess bending or contact with hot components. The result is a plug wire solution that integrates seamlessly into LS conversions, delivering reliable ignition timing without the need for custom adapters.
Consistent Electrical Performance
Low resistance alone does not guarantee a clean spark. The built-in advanced RFI noise suppression filters out unwanted frequencies that can trigger false sensor readings or disrupt radio equipment. By minimizing noise and preserving coil output, these wires reduce misfire potential and improve fuel burn efficiency. The durable silicone jacket also offers resistance to oil, chemicals, and abrasion for dependable operation in harsh underhood conditions. Whether on the street or at the strip, drivers will notice crisper throttle response, dependable startup, and stable idle as a direct benefit of uninterrupted spark energy.
These 12 inch wires ensure reliable ignition control in LS conversions. For those looking for the same wires but need shorter wires because these are too long, consider our Extreme Race Wires 8 Inch.