SET OF 4 PERFORMANCE SPARK PLUG Honda VTX1800R (2007-2002) * W2T121DOR15LGSZK4R1T118 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