The Spark Plug Wire that actually increases power and mileage, and provides quicker, easier starting. These Wires are 8.5mm thick with a spiral core conductor and 100% silicone insulation. The 8.5 thickness is optimal, because thicker wires slow down spark travel.  No radio interference.

Ultra Fit Energy Core Spark Plug Wires are factory made to within
2 inches of an OEM wire set. For most V-8 Engines: $74.00 Order
 
Pro Fit Energy Core Spark Plug Wires are for use in 4 and 6 cylinder engines, or where custom lengths are required. Jacobs Uni Clip technology allows the customer to finish the wires to the correct length.
 
Most 8 Cylinder Engines: $81.00 Order
Most 6 Cylinder Engines: $63.00 Order
Most 4 Cylinder Engines: $50.00 Order