The Spark Plug Wire specifically found in Toyota Supra automobiles is instrumental in delivering electricity from the ignition coil to spark plugs, to trigger the ignition process before the car could start. They are sometimes referred to as high tension leads or HT leads Common application leads manufactured from thick and heat resistant materials to prevent occurrence of arcs. They are accurately fashioned with the lengths which are required with metallic ends meant for connection. Modern Spark Plug Wires contain features to minimize cross interference signal, and high caliber Spark Plug Wires may contain brass parts to prevent rusting. Some older engines may contain a coil wire, however more recent designs will contain coil packs or individual ignition coils which are sited directly on spark plugs; thus eliminating the need for Spark Plug Wires. Maintenance and positioning of these wires are properly very crucial to the performance and lifetime of an engine.
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