{"product_id":"jb4-plug-and-play-performance-tuner-mercedes-benz-c300-e300-glc300-slc300","title":"JB4 Plug-and-Play Performance Tuner – Mercedes-Benz C300, E300, GLC300, \u0026 SLC300","description":"\u003cdiv style=\"font-family: Arial, sans-serif; color: #333; line-height: 1.65; max-width: 900px; margin: auto; padding: 25px;\"\u003e\n\u003cp style=\"font-size: 18px; text-align: center;\"\u003eThe \u003cstrong\u003eJB4 Performance Tuner\u003c\/strong\u003e is the most advanced plug-and-play tuning system available for the Mercedes-Benz M274 platform. It safely increases boost, optimizes timing and fueling, and delivers strong horsepower and torque gains while maintaining factory-smooth drivability.\u003c\/p\u003e\n\u003ch2 style=\"color: #004aad;\"\u003eProven Power Gains\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUp to +40–60 WHP\u003c\/strong\u003e on C300 \/ GLC300 \/ GLE300 models\u003c\/li\u003e\n\u003cli\u003eEven higher results possible with supporting mods, race fuel, or E85 blends\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBoost is safely increased by approximately \u003cstrong\u003e3–6 PSI\u003c\/strong\u003e, with timing and fueling intelligently managed for reliability.\u003c\/p\u003e\n\u003ch2 style=\"color: #004aad;\"\u003eTrue Plug \u0026amp; Play Installation\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eInstalls in minutes using easy-to-access connections on top of the engine\u003c\/li\u003e\n\u003cli\u003eNo cutting, splicing, or permanent modifications\u003c\/li\u003e\n\u003cli\u003eFully reversible and leaves no trace when removed\u003c\/li\u003e\n\u003cli\u003eCompatible with both AWD and RWD vehicles\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"color: #004aad;\"\u003eAdvanced CANbus Integration\u003c\/h2\u003e\n\u003cp\u003eUnlike basic piggyback devices, the JB4 uses full \u003cstrong\u003eCANbus OBDII integration\u003c\/strong\u003e to monitor real-time engine data and make intelligent adjustments for smoother, safer performance.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFuel and spark control for high-power operation\u003c\/li\u003e\n\u003cli\u003eBetter drivability than non-integrated chip tunes\u003c\/li\u003e\n\u003cli\u003eOptional BCM support for advanced boost control\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"color: #004aad;\"\u003eSmartphone Control \u0026amp; Datalogging\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eChange maps on the fly via iOS or Android\u003c\/li\u003e\n\u003cli\u003eView and log up to 40 engine parameters in real time\u003c\/li\u003e\n\u003cli\u003eRead and clear diagnostic fault codes\u003c\/li\u003e\n\u003cli\u003eFirmware updates and new maps available over the air\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"font-size: 14px; color: #666;\"\u003e\u003cem\u003eJB4 Mobile app sold separately. Bluetooth adapter required.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2 style=\"color: #004aad;\"\u003eExclusive JB4 Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUp to 8 preloaded tuning maps\u003c\/li\u003e\n\u003cli\u003eE85 \/ ethanol compatible maps\u003c\/li\u003e\n\u003cli\u003eUser-adjustable boost-by-gear\u003c\/li\u003e\n\u003cli\u003eValet mode with reduced power\u003c\/li\u003e\n\u003cli\u003eExhaust flap control on supported vehicles\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"color: #004aad;\"\u003eExact M274 Compatibility\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eC-Class:\u003c\/strong\u003e C300 (W205)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eE-Class:\u003c\/strong\u003e E300 (W213)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGLC:\u003c\/strong\u003e GLC300 (X253)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSLC:\u003c\/strong\u003e SLC300 (R172)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"font-size: 14px; color: #666;\"\u003e2019+ models use updated SENT pressure sensors and require the correct JB4 version. Please confirm your vehicle details when ordering.\u003c\/p\u003e\n\u003ch2 style=\"color: #004aad;\"\u003eKey Benefits\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eNoticeably stronger acceleration and mid-range pull\u003c\/li\u003e\n\u003cli\u003eFuel economy remains largely unchanged during normal driving\u003c\/li\u003e\n\u003cli\u003e91+ octane recommended\u003c\/li\u003e\n\u003cli\u003eNot VIN-locked — transferable or resellable\u003c\/li\u003e\n\u003cli\u003eRugged billet aluminum enclosure\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e5-Year Manufacturer Warranty\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"text-align: center; font-size: 14px; color: #666;\"\u003e\u003cstrong\u003eBenzUnited Parts\u003c\/strong\u003e • Trusted Mercedes Performance Solutions\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":50604883640495,"sku":"BU-JB4-M274-M276","price":699.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/mercedes-benz-c-class-tuner-C300-jb4.webp?v=1791572965","url":"https:\/\/benzunitedparts.com\/products\/jb4-plug-and-play-performance-tuner-mercedes-benz-c300-e300-glc300-slc300","provider":"BenzUnited Parts","version":"1.0","type":"link"}