I work at Roush Racing and we have done extensive research on all of the products we us for our race cars.On our Dyno's hands down the best spark plug wire on the market is made by a company called Magnecor Their wires outperform Taylor,MSD,Moroso,Accel & others,their website is
www.magnecor.com,they are located in Walled Lake,Michigan.They have wires for most applications in 7mm 8mm 8.5mm racing & 10mm racing,but may cost a few extra bucks.