Spark Plug, Bosch Platinum +4

Platinum+4's unique revolutionary firing technology combines the advantages of surface air gap technology, four ground electrodes, and a heat-fused center electrode with four times the amount of pure platinum, creating the most powerful spark you can buy.

Fits:
Boxster 97-99

Reference/Interchange Numbers:
99917020190/999.170.201.90
FGR7DQP