{"product_id":"rlp-spark-plug-wire-set-8-5mm-red-silicone-jacket-with-90-boots-and-stainless-terminals","title":"RLP Spark Plug Wire Set 8.5mm — Red Silicone Jacket with 90° Boots and Stainless Terminals","description":"\u003cp\u003e\u003cstrong\u003eRLP's Universal 8.5mm spark plug wire set is a high-temperature, high-strength replacement that delivers improved ignition energy and corrosion-resistant terminals for street-driven vehicles.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis wire set upgrades factory ignition wiring with an 8.5mm conductive core, a rugged fiberglass braid and a glossy red silicone jacket rated to 450°F. Built for universal and custom-fit applications, the set is engineered to meet or exceed SAE performance criteria while offering resistance to moisture, chemicals, and heat. It features 90-degree boots for convenient routing and stainless steel plug terminals for long-term conductivity and corrosion protection.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this wire set improve everyday driving performance?\u003c\/h3\u003e\n\u003cp\u003eBy combining a conductive carbon-black core with 5,000 ohms per foot resistance and a high dielectric EPDM inner layer, more energy reaches the spark plug for a hotter, longer-lasting spark. That improved spark can support smoother idle, firmer throttle response, and more consistent combustion under load.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eConductive carbon-black core for effective RFI suppression and energy transfer\u003c\/li\u003e\n  \u003cli\u003e5000 ohms\/ft resistance to focus ignition energy at the plug\u003c\/li\u003e\n  \u003cli\u003eFiberglass braid increases tensile strength and terminal retention\u003c\/li\u003e\n  \u003cli\u003eStainless steel terminals deliver reliable electrical contact and corrosion resistance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat makes the silicone jacket and construction durable?\u003c\/h3\u003e\n\u003cp\u003eThe wires are covered in a high-gloss double silicone jacket rated to 450°F, which resists cracking, oil, and chemical exposure better than simpler rubber jackets. Under that jacket, EPDM insulation plus a tightly woven fiberglass braid add mechanical strength and protect core integrity over prolonged heat cycles.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e450°F-rated silicone resists heat, chemicals and moisture\u003c\/li\u003e\n  \u003cli\u003eDouble silicone construction for improved wear life and appearance\u003c\/li\u003e\n  \u003cli\u003eTightly woven fiberglass braid prevents stretch and improves terminal grip\u003c\/li\u003e\n  \u003cli\u003eEPDM inner insulation maintains dielectric strength at high temperature\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCan I use this set on different vehicles and replace part 4041?\u003c\/h3\u003e\n\u003cp\u003eYes — this RLP set is designed as a universal and custom-fit option suitable for many early and late-model cars and trucks. It is offered as a replacement for part number 4041, and its 90° boots help accommodate common routing in crowded engine bays.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eUniversal and custom-fit applications for cars and trucks\u003c\/li\u003e\n  \u003cli\u003eDesigned to replace part number 4041\u003c\/li\u003e\n  \u003cli\u003e90° boots aid routing near valve covers and distributor caps\u003c\/li\u003e\n  \u003cli\u003ePre- and post-HEI-compatible for many ignition systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat warranty and maintenance should I expect?\u003c\/h3\u003e\n\u003cp\u003eRLP backs this wire set with a two-year warranty covering defects in materials and workmanship. Routine inspection for damaged boots, cracked insulation, or loose terminals helps ensure reliable performance over time.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e2-year limited warranty for manufacturing defects\u003c\/li\u003e\n  \u003cli\u003eInspect boots and terminals periodically for wear or corrosion\u003c\/li\u003e\n  \u003cli\u003eReplace if insulation is nicked or if spark leakage is detected\u003c\/li\u003e\n  \u003cli\u003eKeep connectors clean and properly seated for best conductivity\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: Drivers and DIY mechanics who want a durable, street-oriented ignition upgrade that balances performance and reliability. This set suits owners restoring older vehicles, tuning daily-driven cars for better response, or anyone replacing worn OE wires with higher-heat, corrosion-resistant components. If you need universal fitment with robust materials and RFI suppression for everyday road use, this RLP 8.5mm red silicone wire set is built to deliver.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will these wires fit my car in place of part 4041?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. This RLP set is designed to replace part number 4041 and fits many universal and custom applications; verify length and boot angle for your vehicle.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are these wires heat-resistant for high-temperature engines?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The double silicone jacket is rated to 450°F and the fiberglass braid and EPDM insulation add thermal durability.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"RLP","offers":[{"title":"Default Title","offer_id":55168442761559,"sku":"B09WVJ3D67","price":66.26,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/rlp-red-spark-plug-wire-set-front-packaging.jpg?v=1790404019","url":"https:\/\/britishgarage.co.uk\/products\/rlp-spark-plug-wire-set-8-5mm-red-silicone-jacket-with-90-boots-and-stainless-terminals","provider":"British Garage","version":"1.0","type":"link"}