{"product_id":"custom-ecu-tune-for-mercedes-m273-v8-e550-cls550-cl550-s550-sl550-copy","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: 19px; font-weight: bold;\"\u003eM273 Custom ECU Tune + Bolt-Ons\u003c\/p\u003e\n\u003cp style=\"text-align: center; font-size: 16px; color: #555;\"\u003eUp to +40 HP | Sharper throttle • Stronger mid-range • Refined V8 feel\u003c\/p\u003e\n\u003c!-- Variant Selector --\u003e\n\u003cdiv style=\"background: #f8f9fa; padding: 20px; border: 2px solid #004aad; border-radius: 10px; margin: 22px 0;\"\u003e\n\u003cstrong\u003eBuild Your Package:\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003e1. Intake Filter\u003c\/strong\u003e\u003cbr\u003e⬜ No Filter (Tune Only)    ⬜ K\u0026amp;N Drop-In Filter    ⬜ High-Flow (AFE \/ BMC)\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003e2. X-Pipe\u003c\/strong\u003e\u003cbr\u003e⬜ No X-Pipe    ⬜ Add High-Flow X-Pipe (+$389)\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003e3. Headers\u003c\/strong\u003e\u003cbr\u003e⬜ No Headers    ⬜ Add Mid-Length Headers (+$689)    ⬜ Add Long Tube Headers (+$899)\n\u003cp style=\"margin-top: 16px; color: #0066cc; font-weight: bold;\"\u003e✅ All options include the full custom M273 ECU tune + OBD cable + support\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp style=\"text-align: center; font-size: 17px;\"\u003e\u003cb\u003eChoose your add-ons above and add the complete package to cart\u003c\/b\u003e\u003c\/p\u003e\n\u003chr style=\"margin: 25px 0;\"\u003e\n\u003ch2 style=\"color: #004aad;\"\u003eM273 5.5L V8 Custom ECU Tune\u003c\/h2\u003e\n\u003cp\u003eThe foundation of every build is our bespoke ECU calibration for your M273 V8 — not a generic flash. We refine throttle response, torque delivery, ignition timing, and fueling for a noticeable improvement in real-world driving.\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\u003cdiv style=\"text-align: center; margin: 25px 0;\"\u003e\u003ca style=\"background: #004aad; color: white; padding: 14px 32px; border-radius: 6px; text-decoration: none; font-weight: bold;\" href=\"#\"\u003eAdd Selected Filter • X-Pipe • Headers + Custom Tune to Cart →\u003c\/a\u003e\u003c\/div\u003e\n\u003chr style=\"margin: 25px 0;\"\u003e\n\u003ch2 style=\"color: #004aad;\"\u003eCompatible Vehicles\u003c\/h2\u003e\n\u003cul style=\"columns: 2; -webkit-columns: 2; -moz-columns: 2; gap: 32px;\"\u003e\n\u003cli\u003eE550 • CLS550 • S550 • CL550 • SL550 • CLK550\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"color: #004aad;\"\u003eHow It Works\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eSelect your options above and complete purchase\u003c\/li\u003e\n\u003cli\u003eWe send the OBD cable + read instructions\u003c\/li\u003e\n\u003cli\u003eSend us your stock file → receive your custom tune\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp style=\"text-align: center; font-weight: bold; margin-top: 25px;\"\u003eReady to build your perfect M273 setup?\u003c\/p\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-copy","provider":"BenzUnited Parts","version":"1.0","type":"link"}