Spark Plug, Bosch Silver High Performance - E30 M3

We have been unable to source these spark plugs from Bosch or any other supplier. It may be discontinued. See NGK DR8ES for a comparable colder plug.

This Bosch spark plug is one step colder on the heat range than the original plugs. This is valuable on highly-tuned S14 engines that may experience pinging/detonation at high RPM. Bosch was the original supplier to BMW for this spark plug as well as most of the other ignition components and other parts and systems on your car.