RLP Spark Plug Wire Set for GM LS3/LS4/LS7 - 9070C Extreme 9000 Ceramic Boots, 8mm High-Heat Ferro-Spiral

RLP Extreme 9000 spark plug wire set (9070C) is a high-heat, low-resistance ignition wire kit with ceramic boots engineered to fit Gen IV GM LS3/LS4/LS7 engines.

These wires are built for high-performance GM V8 and V6 applications where heat, interference and reliable spark delivery matter. The RLP 9070C set combines a 500 ohm/foot ferro-spiral core for strong RFI/EMI suppression, stainless-steel spark plug terminals for efficient energy transfer, and high-temperature ceramic boots that tolerate extreme under-hood conditions. The kit is a direct-fit replacement for many Cadillac, Chevy and GMC models from the mid-2000s and is designed for technicians and enthusiasts who need dependable ignition performance under demanding conditions.

What makes the Extreme 9000 wires different from stock ignition leads?

These wires use tougher materials and a specialized core to improve durability and reduce electrical noise. Compared with standard OEM leads they offer higher heat resistance at the boot and greater suppression of radio-frequency interference that can affect engine electronics and in-car radio.

• Ferro-spiral core rated at 500 ohms/foot for consistent spark and RFI/EMI suppression
• Stainless-steel terminals for improved conductivity and corrosion resistance
• Ceramic spark plug boots rated to 2,000°F to resist heat soak near headers and manifolds
• 8.0mm double silicone wire jacket rated to 600°F for abrasion and heat durability

Which vehicles and engines does this 9070C kit fit?

The RLP 9070C set is built as a direct replacement for many GM Gen IV LS-family engines, including LS3, LS4 and LS7 configurations. Fitment covers a broad list of mid-2000s Cadillac, Chevy and GMC models — check the vehicle list and part compatibility before purchase to ensure correct routing and terminal types.

• Compatible with GM models: Cadillac CTS, Escalade; Chevy Corvette, Silverado, Avalanche, Impala, Tahoe; GMC Sierra, Yukon, Envoy and others
• Designed for Gen IV LS3 / LS4 / LS7 engines and coil-pack distributor terminal ends
• Replaces OEM part number 9070C for direct replacement ease
• Includes 135° spark plug boot end angle to match factory plug access on many GM engines

How will these wires affect engine performance and reliability?

Upgrading to the Extreme 9000 wires helps maintain consistent spark delivery under heat and electrical interference, which supports stable ignition timing and smooth running. While no ignition wire can fix unrelated mechanical faults, replacing old or degraded wires can reduce misfires, rough idle and starting issues caused by poor spark conduction.

• Improves spark energy transfer to plugs via stainless-steel terminals
• Reduces electrical noise that can impact sensors and audio systems
• Ceramic boots and silicone jackets resist heat and abrasion for longer service life
• Simple bolt-on replacement with factory-style terminal and boot angles

Who is this for: The RLP 9070C Extreme 9000 spark plug wire set is aimed at DIY mechanics, performance builders and professional technicians working on mid‑2000s GM LS‑series engines who need a durable, high‑heat ignition wire upgrade. It’s especially suited for vehicles exposed to high underhood temperatures, modified engines with increased thermal load, or anyone replacing old, cracked, or electrically noisy ignition leads. A 12-month warranty backs the set; contact RLP if the product fails within the coverage period for replacement or refund.