SET OF 8 PERFORMANCE SPARK PLUG Ford Crown Victoria Police Interceptor 4.6L V8 with all engine serial nr. (all model year) 443PGR15ZCSLP288 1. Higher HP and torque by up to 3 % 2. increased economy by up to 5% 3. 360 Firing Technology 4. Improved acceleration by up to 15 % 5. 25,000 miles - 40,000 km duration