SET OF 2 PERFORMANCE SPARK PLUG KTM 450 SX-F Racing (2013-2006) * R9QT2238AR10ZSYU4R2238 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