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Sumax Pro 8mm Motorcycle Spark Plug Wire sets All new tooling for this models had to be done as customers complained about the Indian stock wires poor plug boot fitment. Our new Indian wires will be made with our Thundervolt 50 core for the best performance. Sumax has been in business for over 35 years bringing you the latest, state of the art, 100% Made in the U.S.A. Spark Plug Wires and Battery Cables. Over the years, we have seen the transition in technology from the early metallic and carbon cores to Spiro-Pro cores. Using the Spiro-Pro core, we achieve ten times the firepower while still offering protection for your bike's computer and electronics. Spiro-Pro features a two-layer, 100% silicone jacket to withstand temperatures up to 600º F. Each wire is terminated to a specific length and features Taylor’s exclusive, 100% Silicone low profile PRO Comp BOOTS®. Our spark plug boots are designed with Resistors for a tight fit. They are vibration proof and have double spring locking spark plug terminals for a secure connection. Now, more than ever, you have countless choices to achieve a great custom look with professional performance. Sumax calls it, “Performance with Color”. Spiro-Pro’s two-layer 100% silicone inner core & outer jacket keeps the wires flexible for the life of your motorcycle maintaining its vibrant color with heat protection to 600º F. Taylor Cable’s Spiro-Pro spark plug wire consists of a high conductive spiral wound core with a Stainless Steel wire and covered with a fluorocarbon conductive material. These spark plug wires feature 350 ohms per foot resistance which provides more fire power to the spark plugs than OEM resistor core wires and has up to 10 times less resistance than standard resistor core wires.