NGK SILZKBR8D8S Laser Iridium plugs standard in N20 and S55 motors. These are 2 heat ranges colder than OEM N54 plugs. We gapped them for you at 0.018"
Suggested for most high output modern turbo BMW's including S55, N55, N20, N54, N63, N63TU, S63, S63TU applications. Recommended for Higher boost, water/meth, and upgraded turbo applications. If you are running E85 we recommend the OEM 12120042724 plugs available HERE.