Spark plug wires are one of those consumable maintenance items that occasionally need replacing. Over time, the resistance of the wire builds up and the wire becomes less efficient at transferring the spark from the distributor to the spark plugs and engine performance suffers. The next time you need a new set of wires, shine the cheapo no-name wires and go with a set of high-performance wires. Aside from the lower resistance aftermarket wires offer, most are available in a do-it-yourself kit that allows you to build your own wires for a perfect fit every time. Check out these 8.5mm Super Conductor wires from MSD and trick tools we used to build our wires.