NGK 97506 2-Step Colder Spark Plug NGK 97506 2-Step Colder Spark Plug ( sold in sets of 4) Click image to enlarge Description NGK 97506 2-Step Colder Spark Plug ( SOLD IN SETS OF 4)  These NGK Laser Iridium replacement plugs are factory standard in BMW N20 & S55 motors. They are two steps colder than stock N54 plugs and suggested for higher boost E85, water/meth injection, and/or upgraded turbocharger applications across all late model turbo BMW models. We suggest setting the gap down to 0.020". These plugs are compatible with all turbo BMW motors including the N20, N54, N55, S55, N63, n63tu, B38, B48, B58, S63, and s63tu. Features & Benefits Often specified as original equipment, NGK Laser Iridium spark plugs are the best combination of performance and longevity. Fine wire Iridium center electrode Platinum pad at ground electrode for even wear in DIS ignition systems Engineered for specific vehicle applications Iridium tip is six (6) times harder than platinum   Pictures sell! Auctiva offers Free Image Hosting and Editing.250+ Listing Templates! Auctiva gets you noticed! The complete eCRATER Selling Solution. Track Page Views WithAuctiva's FREE Counter