{"product_id":"jb4-anti-lag-kit-bms-n54-jb4-upgrades","title":"Burger Motorsports BMS JB4 Anti-Lag Kit for BMW N54 135i \u0026 335i - Instant Boost, Rapid Spool, On-the-Fly Control","description":"\u003cdiv class=\"product__description rte\"\u003e\n  \n  \u003ch2\u003eJB4 Antilag Add-On for BMW N54 135i and 335i\u003c\/h2\u003e\n  \n  \u003cp\u003eGive your twin turbo N54 the edge with this genuine Burger Motorsports antilag add-on for JB4-equipped 135i and 335i. Designed to pre-spool the turbos on demand, it delivers immediate boost for rolling starts and punchy launches, sharper throttle response, and harder acceleration between shifts. Ideal for drivers who want consistent, repeatable performance with their JB4-controlled BMW.\u003c\/p\u003e\n  \n  \u003ch3\u003eWhat you get\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003ePre-programmed control module with model-specific calibration\u003c\/li\u003e\n    \u003cli\u003eDedicated plug-in wiring harness for a clean, reversible fit\u003c\/li\u003e\n    \u003cli\u003eDriver-activated antilag using the factory volume button\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003ch3\u003eWhy enthusiasts choose this upgrade\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003ePreloads the turbos so boost is ready before you go\u003c\/li\u003e\n    \u003cli\u003eStronger roll-on acceleration and harder hits from a dig\u003c\/li\u003e\n    \u003cli\u003eCrisper response during gear changes for brisk, consistent sprints\u003c\/li\u003e\n    \u003cli\u003eGenuine Burger Tuning hardware, designed to integrate with JB4\u003c\/li\u003e\n    \u003cli\u003eProven on our own builds and with customer cars, delivering immediate response and repeatable results\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003ch3\u003eHow to use it\u003c\/h3\u003e\n  \u003col\u003e\n    \u003cli\u003eSelect your gear.\u003c\/li\u003e\n    \u003cli\u003ePress and hold the volume button on the steering control.\u003c\/li\u003e\n    \u003cli\u003eGo full throttle to build boost while stationary or during a roll.\u003c\/li\u003e\n    \u003cli\u003eRelease the button and go with boost already on tap.\u003c\/li\u003e\n  \u003c\/ol\u003e\n  \n  \u003ch3\u003eVehicle compatibility\u003c\/h3\u003e\n  \u003cp\u003eFor BMW 135i and 335i models with the N54 engine running a JB4. Works with manual and automatic transmissions.\u003c\/p\u003e\n  \n  \u003ch3\u003eRequirements\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eJB4 for N54 is required\u003c\/li\u003e\n    \u003cli\u003eBMS back end flash map required\u003c\/li\u003e\n    \u003cli\u003eEthanol blend recommended for best results\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003ch3\u003ePart number\u003c\/h3\u003e\n  \u003cp\u003eE-N54-JB4UG-AL\u003c\/p\u003e\n  \n  \u003ch3\u003eFitting and support\u003c\/h3\u003e\n  \u003cp\u003eProfessional fitting recommended. MJ Modifications in Warwickshire can install and set up this upgrade. Request a fitting quote at \u003ca href=\"mailto:info@mjmodifications.co.uk\"\u003einfo@mjmodifications.co.uk\u003c\/a\u003e.\u003c\/p\u003e\n  \u003cp\u003e\n    \u003ca href=\"http:\/\/www.n54tech.com\/forums\/showthread.php?t=33028\" target=\"_blank\" rel=\"noopener\"\u003eView the installation guide\u003c\/a\u003e\n  \u003c\/p\u003e\n  \n  \u003ch3\u003eCompatibility check before dispatch\u003c\/h3\u003e\n  \u003cp\u003eWe will confirm fitment prior to shipping. Add your UK registration or the last 7 digits of your VIN at checkout so we can verify your N54 JB4 setup.\u003c\/p\u003e\n  \n  \u003ch3\u003eManufacturer and warranty\u003c\/h3\u003e\n  \u003cp\u003eManufactured by Burger Motorsports.\u003c\/p\u003e\n  \u003cp\u003eNote, no manufacturer warranty is offered on this item.\u003c\/p\u003e\n  \n  \u003ch3\u003eSearch-friendly terms\u003c\/h3\u003e\n  \u003cp\u003eJB4 antilag module UK, BMW N54 launch assist, N54 turbo pre-spool kit, JB4 boost builder, BMW 135i tuning upgrade, BMW 335i performance part, twin turbo N54 spooling aid, JB4 add-on UK, Burger Tuning antilag, N54 drag racing mod, rolling race boost builder, two-step style boost pre-load for N54, BMW 3 Series 335i tuning parts, BMW 1 Series 135i performance upgrades.\u003c\/p\u003e\n  \n\u003c\/div\u003e","brand":"BMS","offers":[{"title":"Default Title","offer_id":55976100495746,"sku":null,"price":50.91,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0871\/5445\/8937\/files\/JB4_Anti-Lag_Kit_1946x_e5a7f441-4528-49ba-980c-f64cee89cf75.jpg?v=1763328306","url":"https:\/\/mjmodifications.co.uk\/products\/jb4-anti-lag-kit-bms-n54-jb4-upgrades","provider":"MJ Modifications","version":"1.0","type":"link"}