TWiTCHY
Well-Known Member
Are you sure? FCP Euro says that spark plug goes on the four cylinder engine and doesn't list any B58 compatibility. https://www.fcpeuro.com/products/bmw-silzkbr8d8s-spark-plug-ngk-96987#descriptionNGK 97506
My research is pointing to NGK 94201/SILZKGR8B8S but I also found SILZKGR8E8S being described as a "stronger" variant of NGK 94201 by BM3 Tuning. Odd thing is, this "stronger" one doesn't seem to have a corresponding NGK part number and the NGK site lists no plug compatibility with the Z4 M40i or M340i, which also makes me question compatibility with NGK 94201. This is confusing AF.
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