SET OF 8 PERFORMANCE SPARK PLUG Porsche 928 GT 5.0L V8 with all engine serial nr. (1990) * 2J2PLR15ZCSLUQ98P 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