{"product_id":"custom-ecu-tune-for-mercedes-m273-v8-e550-cls550-cl550-s550-sl550","title":"Custom ECU Tune for Mercedes M273 V8 – E550, CLS550, CL550, S550, SL550","description":"\u003cdiv style=\"font-family: Arial, sans-serif; color: #333; line-height: 1.6; padding: 25px; max-width: 900px; margin: auto;\"\u003e\n\u003cp style=\"text-align: center; font-size: 18px; font-weight: bold; color: #004aad;\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center; font-size: 16px; color: #555;\"\u003eWake up your M273 5.5L V8 with sharper throttle, stronger mid-range torque, and refined power — all while keeping factory smoothness and reliability. Custom ECU Tune + Optional K\u0026amp;N Filters • X-Pipe • Headers (does not affect emissions)\u003c\/p\u003e\n\u003ch2 style=\"color: #004aad;\"\u003eWhat You Can Expect\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUp to +40 HP \/ +37 lb-ft on premium fuel\u003c\/li\u003e\n\u003cli\u003eSharpened throttle with reduced delay\u003c\/li\u003e\n\u003cli\u003eStronger mid-range torque for confident acceleration\u003c\/li\u003e\n\u003cli\u003eSmoother, more refined power delivery\u003c\/li\u003e\n\u003cli\u003eFactory safety systems fully retained\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"color: #004aad;\"\u003eExact Compatibility\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 15px 0;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #004aad; color: white;\"\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd;\"\u003eEngine\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd;\"\u003eYears\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd;\"\u003eBody Styles\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eE550 \/ CLS550\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eM273 5.5L V8\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2006–2011\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eSedan \/ Coupe\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eS550 \/ CL550\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eM273 5.5L V8\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2006–2011\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eSedan \/ Coupe\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eSL550\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eM273 5.5L V8\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2006–2011\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eRoadster\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eCLK550\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eM273 5.5L V8\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2006–2010\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eCoupe \/ Cabriolet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c!-- FAQ Section --\u003e\n\u003ch2 style=\"color: #004aad; margin-top: 35px;\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails style=\"margin-bottom: 12px;\"\u003e\n\u003csummary style=\"font-weight: bold; cursor: pointer;\"\u003eIs this tune safe for my engine?\u003c\/summary\u003e\n\u003cp style=\"margin: 8px 0 0 20px; color: #555;\"\u003eYes. We keep all factory safety systems (knock, temperature, etc.) active and tune conservatively for long-term reliability.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 12px;\"\u003e\n\u003csummary style=\"font-weight: bold; cursor: pointer;\"\u003eHow long does the process take?\u003c\/summary\u003e\n\u003cp style=\"margin: 8px 0 0 20px; color: #555;\"\u003eTypically 2–4 business days after we receive your stock file.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 12px;\"\u003e\n\u003csummary style=\"font-weight: bold; cursor: pointer;\"\u003eWill it pass emissions \/ smog?\u003c\/summary\u003e\n\u003cp style=\"margin: 8px 0 0 20px; color: #555;\"\u003eYes. The tune, X-pipe, filters, and headers do not affect emissions as the factory cats are maintained.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 12px;\"\u003e\n\u003csummary style=\"font-weight: bold; cursor: pointer;\"\u003eCan I install hardware now and tune later?\u003c\/summary\u003e\n\u003cp style=\"margin: 8px 0 0 20px; color: #555;\"\u003eAbsolutely. The car runs reliably with the hardware even without the tune — but you’ll be leaving significant power on the table.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c!-- CTA --\u003e\n\u003cdiv style=\"margin-top: 40px; padding-top: 20px; border-top: 1px solid #ddd; text-align: center; font-size: 14px; color: #666;\"\u003e\n\u003cstrong\u003eBenzUnited Parts • Mercedes Performance \u0026amp; Tuning\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eFitment Guarantee • 30-Day Easy Returns\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"No \/ No \/ No","offer_id":47127339860143,"sku":null,"price":1195.0,"currency_code":"USD","in_stock":true},{"title":"No \/ No \/ Yes","offer_id":47127360274607,"sku":null,"price":1995.0,"currency_code":"USD","in_stock":true},{"title":"No \/ Yes \/ No","offer_id":47127365025967,"sku":null,"price":1229.0,"currency_code":"USD","in_stock":true},{"title":"No \/ Yes \/ Yes","offer_id":47127365058735,"sku":null,"price":2029.0,"currency_code":"USD","in_stock":true},{"title":"Yes \/ No \/ No","offer_id":47127347200175,"sku":null,"price":1325.0,"currency_code":"USD","in_stock":true},{"title":"Yes \/ No \/ Yes","offer_id":47127360307375,"sku":null,"price":2125.0,"currency_code":"USD","in_stock":true},{"title":"Yes \/ Yes \/ No","offer_id":47127365091503,"sku":null,"price":1359.0,"currency_code":"USD","in_stock":true},{"title":"Yes \/ Yes \/ Yes","offer_id":47127365124271,"sku":null,"price":2159.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/OIP_2.jpg?v=1708324391","url":"https:\/\/benzunitedparts.com\/products\/custom-ecu-tune-for-mercedes-m273-v8-e550-cls550-cl550-s550-sl550","provider":"BenzUnited Parts","version":"1.0","type":"link"}