SET OF 4 PERFORMANCE SPARK PLUG Suzuki VZR1800 Boulevard M109R (2009-2006) R9Z7T492AR12ZSYU2147 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