Bosch platinum features a pure platinum center electrode that 's heat-fused into an extended ceramic insulator to eliminate air gaps which exist in platinum alloy-tipped plugs. This superior design reaches its self-cleaning temperature faster. And with a lower ignition voltage requirement, Bosch platinum provides reliable starting in hot and cold weather extremes and provides a more reliable spark at higher rpm 's without misfires. Sold each, this plug fits the following models:

911 turbo 1991-92