SET OF 2 PERFORMANCE SPARK PLUG Kawasaki VN900C Vulcan 900 Classic (2009-2007) R9Z7T394AOR14LGSYU2049 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