409 Spiro-Pro Race Plug Wire Set GM LS 03-14

The 409 Spiro-Pro Race Plug Wire Set GM LS is a professional-grade ignition system designed for General Motors LS-series engine platforms from 2003 to 2014. This complete wire set delivers reliable spark delivery to all cylinders, making it essential for engine builders, performance enthusiasts, and technicians who demand precision ignition timing. The kit is engineered to support both stock and modified LS engines, ensuring consistent combustion and improved overall engine responsiveness across a wide RPM range.

Built by Taylor/Vertex, this ignition wire set features a 10.4 mm spiral core construction that minimizes electromagnetic interference and cross-firing between adjacent cylinders—critical for high-output engines. The 135-degree plug boots provide secure, factory-style connections that resist corrosion and vibration-induced disconnection, while the matching terminals ensure proper fitment with OEM and aftermarket coil packs. The red spiral core design not only improves signal clarity but also aids in quick visual identification during engine work and troubleshooting.

This plug wire set is ideal for owners of LS1, LS2, LS3, LS7, and other LS-variant engines in Camaros, Corvettes, Silverados, and performance swaps. Installation is straightforward—the factory-style boots and terminals require no special tools or adapters, making replacement a quick task whether performed at home or in a professional shop. For those running forced induction, high-compression builds, or extended track sessions, the 409 Spiro-Pro Race Plug Wire Set delivers the durability and electrical performance needed to keep ignition firing precisely under demanding conditions.