{"product_id":"custom-m276-3-5l-v6-ecu-tune-for-mercedes-c350-e350-glk350-ml350","title":"Custom M276 3.5L V6 ECU Tune for Mercedes C350, E350, GLK350, ML350","description":"\u003cdiv style=\"font-family: Arial, sans-serif; color: #333; line-height: 1.65; padding: 25px; max-width: 900px; margin: auto;\"\u003e\n\u003cp style=\"text-align: center; font-size: 16px; color: #555;\"\u003eOptimize throttle mapping, torque delivery, ignition timing, and fueling on your M276 3.5L naturally aspirated V6. Add K\u0026amp;N high-flow filters and a 2.25\" high-flow X-Pipe for maximum gains while retaining your factory catalytic converters.\u003c\/p\u003e\n\u003cdiv style=\"background: #f8f9fa; padding: 20px; border: 2px solid #004aad; border-radius: 10px; margin: 25px 0;\"\u003e\n\u003cstrong\u003eBuild Your Package:\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e⬜ + K\u0026amp;N High-Flow Filters\u003cbr\u003e⬜ + High-Flow X-Pipe\u003cbr\u003e\n\u003cp style=\"margin-top: 12px; color: #0066cc; font-weight: bold;\"\u003e✅ All options include the full custom M276 ECU tune + OBD cable + support\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"color: #004aad;\"\u003eWhat You Can Expect\u003c\/h2\u003e\n\u003cul style=\"padding-left: 20px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e302 HP → 320 HP\u003c\/strong\u003e and \u003cstrong\u003e273 lb-ft → 285 lb-ft\u003c\/strong\u003e on premium fuel — tune only\u003c\/li\u003e\n\u003cli\u003eFurther gains when combined with high-flow filters and X-pipe\u003c\/li\u003e\n\u003cli\u003eSharper throttle response with no lag\u003c\/li\u003e\n\u003cli\u003eStronger mid-range torque for confident acceleration\u003c\/li\u003e\n\u003cli\u003eSmoother power delivery and refined drivability\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;\"\u003eYears\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd;\"\u003eEngine\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;\"\u003eC350 \/ C300 4MATIC\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2012–2015\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eM276 3.5L V6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eE350\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2012–2017\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eM276 3.5L V6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eGLK350\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2013–2015\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eM276 3.5L V6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eML350 \/ GLE350\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2012–2018\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eM276 3.5L V6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eSLK350\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2012–2016\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eM276 3.5L V6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"font-size: 14px; color: #666;\"\u003eNaturally aspirated M276 only. Not for the M276 3.0L BiTurbo found in the C43, C450, E43, and GLC43 — see our dedicated M276 BiTurbo tune for those.\u003c\/p\u003e\n\u003ch2 style=\"color: #004aad; margin-top: 35px;\"\u003eGetting the Most From the X-Pipe\u003c\/h2\u003e\n\u003cp\u003ePlacement matters. Mounting the X-pipe as far forward in the exhaust as your chassis allows improves exhaust scavenging — the crossover equalizes pulses between banks earlier in the system, which helps cylinder filling and lets the tune take better advantage of the improved flow. The further back it sits, the less it does. We build your calibration around whatever configuration you are running, so tell us at checkout.\u003c\/p\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 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 ECU file. Ship us your ECU, or use the included OBD data cable to pull and flash your file remotely from your own driveway.\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;\"\u003eThe tune, K\u0026amp;N filters, and X-pipe do not remove any emissions equipment — your factory catalytic converters are retained.\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 the hardware first and tune later?\u003c\/summary\u003e\n\u003cp style=\"margin: 8px 0 0 20px; color: #555;\"\u003eAbsolutely. The car runs reliably with the filters and X-pipe even without the tune — but you’ll be leaving significant power on the table.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 12px;\"\u003e\n\u003csummary style=\"font-weight: bold; cursor: pointer;\"\u003eWhat fuel does it require?\u003c\/summary\u003e\n\u003cp style=\"margin: 8px 0 0 20px; color: #555;\"\u003e91 octane or higher after tuning. The calibration is built around premium fuel so it can make the power safely.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 12px;\"\u003e\n\u003csummary style=\"font-weight: bold; cursor: pointer;\"\u003eCan I go back to stock?\u003c\/summary\u003e\n\u003cp style=\"margin: 8px 0 0 20px; color: #555;\"\u003eYes. We archive your original factory file, so your ECU can be returned to stock at any time.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdiv style=\"text-align: center; margin: 40px 0;\"\u003e\u003ca style=\"background: #b30000; color: white; padding: 16px 42px; font-size: 19px; text-decoration: none; border-radius: 8px; font-weight: bold;\" href=\"#\"\u003e M276 Performance Package\u003c\/a\u003e\u003c\/div\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\u003c\/strong\u003e • Mercedes Performance \u0026amp; Tuning\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"No \/ No","offer_id":47211549819055,"sku":"TUNE-M276-NA-BASE","price":700.0,"currency_code":"USD","in_stock":true},{"title":"Yes \/ No","offer_id":47211549851823,"sku":"TUNE-M276-NA-KN","price":768.0,"currency_code":"USD","in_stock":true},{"title":"No \/ Yes","offer_id":47211549884591,"sku":"TUNE-M276-NA-XP","price":736.99,"currency_code":"USD","in_stock":true},{"title":"Yes \/ Yes","offer_id":47211549917359,"sku":"TUNE-M276-NA-KN-XP","price":804.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/Mercedes-Benz_Motor_276_Typ_S_400_Hybrid.jpg?v=1784704955","url":"https:\/\/benzunitedparts.com\/products\/custom-m276-3-5l-v6-ecu-tune-for-mercedes-c350-e350-glk350-ml350","provider":"BenzUnited Parts","version":"1.0","type":"link"}