NGK SILZKBR8D8S (97506) replacement plugs are factory standard in BMW N20 & S55 motors. They are two steps colder than stock N54 plugs and suggested for E85, water/meth injection, upgraded turbos, or single turbo applications.
Can be used in the following BMW motors … N20, N54, N55, S55, N63, N63TU, S63, and S63TU
- Trivalent metal plating provides superior anti-corrosion and anti-seizing properties
- Corrugated ribs prevent flashover
- Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer
- Copper core aids in heat removal
- Triple seals prevent leakage