SET OF 4 PERFORMANCE SPARK PLUG Nissan Altima 2.5L L4 with QR25DE engine serial nr. (all model year) * 833IP1EOR15LGS46P2PL1 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