{"product_id":"cold-spark-plug-set-s58","title":"Cold Spark Plug Set — S58","description":"\u003cp\u003e\u003cstrong\u003eOne-step-colder spark plug set for the S58 platform.\u003c\/strong\u003e Six plugs, NGK or Denso, validated heat range for G8X \/ G87 \/ F97 \/ F98 M-cars running Stage 2 or higher boost. The S58's closed-deck block and twin-turbo configuration runs cylinder pressures meaningfully higher than the B58 at the same gear's peak boost — heat range matters more on this engine than on any other current BMW.\u003c\/p\u003e\n\n\u003ch3\u003eS58-specific considerations\u003c\/h3\u003e\n\u003cp\u003eThe S58 ships with a relatively conservative OEM plug heat range. At Stage 1 calibration on stock turbos, the OEM plugs remain within margin. At Stage 2 (meaningful boost peak) and especially Stage 3 (~26+ psi with upgraded turbos), the OEM plug heat range becomes the limiting factor on safe timing advance during sustained track-driven pulls. Going one step colder is mandatory at Stage 2+ for any S58 build you're driving hard.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's in the box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eSet of 6 one-step-colder plugs (NGK or Denso — model spec matched to your S58 variant at intake)\u003c\/li\u003e\n  \u003cli\u003eOEM-equivalent gap pre-set; verify with feeler gauge before install\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eService interval consideration\u003c\/h3\u003e\n\u003cp\u003eFor S58 builds seeing track time, we recommend plug inspection at half the OEM service interval — every ~15,000 miles instead of 30,000 — and replacement on the early side. Plug condition is the canary for combustion behavior; if the plugs show heat-scoring or unusual erosion patterns, the calibration wants a closer look.\u003c\/p\u003e\n\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cp\u003eS58 platform — G80 M3, G82 M4, G83 M4 Convertible, G87 M2, F97 X3 M, F98 X4 M. All variants supported. Confirm production year at intake (CS variants may run slightly different spec).\u003c\/p\u003e","brand":"Esse Werks","offers":[{"title":"Default Title","offer_id":43280734453821,"sku":"EW-PLUG-COLD-S58","price":145.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/2553\/8109\/files\/dinan_cold_spark_BLK01.webp?v=1781742811","url":"https:\/\/essewerks.com\/products\/cold-spark-plug-set-s58","provider":"Esse Werks","version":"1.0","type":"link"}