{"product_id":"tune-g23-m440i-conv","title":"BMW G23 M440i Convertible — Custom BM3 Tune","description":"\u003cp\u003e\u003cstrong\u003eLogged, verified, revised. Documented in writing. Yours to keep.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA custom bootmod3 calibration for the G23 (B58) — built from datalogs on your car, not a map off a shelf. We start from what your engine is actually doing in fuel trims, timing, knock, and load, and revise against the next log until the math and the data agree.\u003c\/p\u003e\n\u003ch3\u003eHow we approach it\u003c\/h3\u003e\n\u003cp\u003eMath first, datalogs second, marketing claims a distant last. We don’t publish dyno numbers we can’t reproduce; we tune to what your specific car does on the fuel you actually buy.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/pages\/configure\"\u003eConfigure your tune →\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eThe matched Stage Kit for this engine — components + the calibration sold as one decision — is the \u003ca href=\"\/products\/stage-2-kit-b58\"\u003eStage 2 Kit — B58\u003c\/a\u003e. 8% under buying the parts and tune à la carte.\u003c\/p\u003e","brand":"Esse Werks","offers":[{"title":"Stage 1","offer_id":43280680714301,"sku":"EW-TUNE-G23-M440I-CONV-S1","price":495.0,"currency_code":"USD","in_stock":true},{"title":"Stage 2","offer_id":43280680747069,"sku":"EW-TUNE-G23-M440I-CONV-S2","price":595.0,"currency_code":"USD","in_stock":true},{"title":"Stage 3","offer_id":43280680779837,"sku":"EW-TUNE-G23-M440I-CONV-S3","price":895.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/2553\/8109\/files\/tune-card-b58_d66b6eea-c84a-4ade-be65-4e3e39955687.png?v=1781742509","url":"https:\/\/essewerks.com\/products\/tune-g23-m440i-conv","provider":"Esse Werks","version":"1.0","type":"link"}