Platinukmms are made for longevity, copper plugs provide better conductivity and spark. The only reason platinums are used is so people can go 100K without changing plugs, tehy are NOT the best for performance. Cheap copper plugs are. I use autolite coppers in my car. Also don't get piece of **** wires. Buy only good brands such as Ford, MSD, Accel, etc.