SET OF 4 PERFORMANCE SPARK PLUG Toyota Corolla 1.6L with 3ZZ-FE engine serial nr. (all model year) 77IP1DOR15LGSL58VB4 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