{"title":"MS4X Tuning","description":null,"products":[{"product_id":"bmw-e46-ms43-full-bolt-on-calibration","title":"BMW E46 MS43 Full Bolt-On Calibration","description":"\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003eOptimize your BMW's naturally aspirated performance with a custom LRW calibration for the Siemens MS43 ECU. Designed for M54-powered vehicles equipped with full bolt-on modifications, this calibration focuses on improving throttle response, power delivery, and overall drivability while taking full advantage of your engine's modifications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSupported Applications:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eBMW E46 325i \/ 330i \/ 325Ci \/ 330Ci\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eBMW E39 525i \/ 530i\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eOther compatible M5X vehicles equipped with a Siemens MS43 engine management.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSupported Modifications:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003ePerformance intake systems.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eUpgraded exhaust headers.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCat-back exhaust systems.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eUpgraded intake manifolds.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eLarger throttle bodies.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eOther naturally aspirated bolt-on modifications (please specify in your modification list).\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eCalibration Includes:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eCustom fuel and ignition calibration.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eVANOS optimization.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eThrottle response adjustments.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eMAF calibration as required.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eRPM limiter adjustments where appropriate.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDatalog review and calibration refinement.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eTwo tuning revisions included.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTuning Requirements:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eRemote tuning requires a compatible MS43 flashing interface and the ability to read, write, and datalog the ECU. Customers must provide their current ECU file, complete modification list, and intended fuel octane.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAfter purchasing, please email your current ECU file and order number to \u003c\/span\u003e\u003ca href=\"mailto:Michael.Leto@lrwtuned.com\"\u003e\u003cstrong\u003e\u003cspan\u003eMichael.Leto@lrwtuned.com\u003c\/span\u003e\u003c\/strong\u003e\u003c\/a\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAdditional Information:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis calibration is intended for naturally aspirated applications only. Turbocharged, supercharged, and extensively modified engine combinations require a separate custom tuning service.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePower gains will vary depending on engine condition, installed modifications, and fuel quality. All vehicles must be mechanically sound before tuning begins.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePlease review our \u003c\/span\u003e\u003ca href=\"https:\/\/lrwtuned.com\/pages\/pre-tune-checklist\"\u003e\u003cspan\u003ePre-Tune Checklist\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e before beginning your tuning session.\u003c\/span\u003e\u003c\/p\u003e","brand":"Leto Race Werks","offers":[{"title":"2.5L (M54B25) \/ 91 \/ Launch Control","offer_id":68361642148091,"sku":null,"price":225.0,"currency_code":"USD","in_stock":true},{"title":"2.5L (M54B25) \/ 91 \/ Ignition Cut Limiter","offer_id":68361642180859,"sku":null,"price":225.0,"currency_code":"USD","in_stock":true},{"title":"2.5L (M54B25) \/ 91 \/ Both","offer_id":68361642213627,"sku":null,"price":250.0,"currency_code":"USD","in_stock":true},{"title":"2.5L (M54B25) \/ 91 \/ Neither","offer_id":68361642246395,"sku":null,"price":200.0,"currency_code":"USD","in_stock":true},{"title":"2.5L (M54B25) \/ 93 \/ Launch Control","offer_id":68361642279163,"sku":null,"price":225.0,"currency_code":"USD","in_stock":true},{"title":"2.5L (M54B25) \/ 93 \/ Ignition Cut Limiter","offer_id":68361642311931,"sku":null,"price":225.0,"currency_code":"USD","in_stock":true},{"title":"2.5L (M54B25) \/ 93 \/ Both","offer_id":68361642344699,"sku":null,"price":250.0,"currency_code":"USD","in_stock":true},{"title":"2.5L (M54B25) \/ 93 \/ Neither","offer_id":68361642377467,"sku":null,"price":200.0,"currency_code":"USD","in_stock":true},{"title":"2.8L (M52TUB28 - MS43 Swapped Only) \/ 91 \/ Launch Control","offer_id":68361642410235,"sku":null,"price":225.0,"currency_code":"USD","in_stock":true},{"title":"2.8L (M52TUB28 - MS43 Swapped Only) \/ 91 \/ Ignition Cut Limiter","offer_id":68361642443003,"sku":null,"price":225.0,"currency_code":"USD","in_stock":true},{"title":"2.8L (M52TUB28 - MS43 Swapped Only) \/ 91 \/ Both","offer_id":68361642475771,"sku":null,"price":250.0,"currency_code":"USD","in_stock":true},{"title":"2.8L (M52TUB28 - MS43 Swapped Only) \/ 91 \/ Neither","offer_id":68361642508539,"sku":null,"price":200.0,"currency_code":"USD","in_stock":true},{"title":"2.8L (M52TUB28 - MS43 Swapped Only) \/ 93 \/ Launch Control","offer_id":68361642541307,"sku":null,"price":225.0,"currency_code":"USD","in_stock":true},{"title":"2.8L (M52TUB28 - MS43 Swapped Only) \/ 93 \/ Ignition Cut Limiter","offer_id":68361642574075,"sku":null,"price":225.0,"currency_code":"USD","in_stock":true},{"title":"2.8L (M52TUB28 - MS43 Swapped Only) \/ 93 \/ Both","offer_id":68361642606843,"sku":null,"price":250.0,"currency_code":"USD","in_stock":true},{"title":"2.8L (M52TUB28 - MS43 Swapped Only) \/ 93 \/ Neither","offer_id":68361642639611,"sku":null,"price":200.0,"currency_code":"USD","in_stock":true},{"title":"3.0L (M54B30) \/ 91 \/ Launch Control","offer_id":68361642672379,"sku":null,"price":225.0,"currency_code":"USD","in_stock":true},{"title":"3.0L (M54B30) \/ 91 \/ Ignition Cut Limiter","offer_id":68361642705147,"sku":null,"price":225.0,"currency_code":"USD","in_stock":true},{"title":"3.0L (M54B30) \/ 91 \/ Both","offer_id":68361642737915,"sku":null,"price":250.0,"currency_code":"USD","in_stock":true},{"title":"3.0L (M54B30) \/ 91 \/ Neither","offer_id":68361642770683,"sku":null,"price":200.0,"currency_code":"USD","in_stock":true},{"title":"3.0L (M54B30) \/ 93 \/ Launch Control","offer_id":68361642803451,"sku":null,"price":225.0,"currency_code":"USD","in_stock":true},{"title":"3.0L (M54B30) \/ 93 \/ Ignition Cut Limiter","offer_id":68361642836219,"sku":null,"price":225.0,"currency_code":"USD","in_stock":true},{"title":"3.0L (M54B30) \/ 93 \/ Both","offer_id":68361642868987,"sku":null,"price":250.0,"currency_code":"USD","in_stock":true},{"title":"3.0L (M54B30) \/ 93 \/ Neither","offer_id":68361642901755,"sku":null,"price":200.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0739\/1454\/8475\/files\/downstar-inc-engine-bay-titanium-bmw-e46-2000-2006-dress-up-hardware-kit-46675507675419.jpg?v=1792521786"},{"product_id":"bmw-e46-ms43-forced-induction-calibration","title":"BMW E46 MS43 Forced Induction Calibration","description":"\u003cp\u003e\u003cspan\u003eTake your M5X-powered BMW beyond its naturally aspirated limits with a custom LRW forced induction calibration for the Siemens MS43 ECU. Designed for turbocharged and supercharged applications, this service provides individualized calibration tailored to your engine, fuel system, airflow configuration, and performance goals.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWhether you're building a responsive street car or a higher-horsepower setup, our focus is on delivering reliable power, consistent fueling, and refined drivability.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eSupported Applications\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eBMW E46 325i \/ 330i \/ 325Ci \/ 330Ci\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eBMW E39 525i \/ 530i\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eOther compatible M54X applications equipped with Siemens MS43 engine management.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eMinimum Hardware Requirements\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eFuel Injectors:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e DeatschWerks 650cc injectors (P\/N 17U-01-0650-6) recommended as our standard minimum for forced induction applications. Equivalent or larger injectors may be accepted with appropriate calibration data and approval.\u003c\/span\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eMAF \/ MAP Sensor:\u003c\/strong\u003e HPX or equivalent blow-through MAF, or a supported MAP-based configuration.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eFuel System:\u003c\/strong\u003e A properly functioning fuel system capable of maintaining the required fuel pressure and delivery under boost.\u003cbr\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eWideband O2 Sensor:\u003c\/strong\u003e A functioning wideband AFR monitoring system for datalogging and calibration validation.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eEngine Condition:\u003c\/strong\u003e The engine must be mechanically sound and free of vacuum leaks, boost leaks, and existing fuel or ignition system issues.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAdditional fuel system or engine modifications may be required depending on the intended horsepower, fuel type, and boost pressure.\u003cbr\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eCalibration Includes\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eCustom fuel and ignition calibration.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eInjector scaling and latency adjustments.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eMAF calibration or supported MAP-based load calibration.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eVANOS optimization for forced induction.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eThrottle response and engine load adjustments.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eBoost-related fueling and ignition optimization.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eRPM limiter adjustments where appropriate.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDatalog review and calibration refinement.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eRequired Information Before Tuning\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eCustomers must provide the following information:\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eEngine displacement and internal modifications.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eComplete turbocharger or supercharger specifications.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eIntended boost pressure and horsepower goals.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eFuel type and octane rating.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eFuel injector manufacturer, model, and flow specifications.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eFuel pump and fuel pressure regulator configuration.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eMAF Configuration:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Specify the exact HPX or equivalent blow-through MAF sensor being used.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eMAP Configuration:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e If using a MAP sensor, provide its manufacturer, part number, and pressure range.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCurrent ECU calibration file.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003cspan\u003eImportant Sensor Requirements:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eCustomers using an uncommon or aftermarket MAF\/MAP sensor must provide a link to the manufacturer's technical datasheet.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFor MAF sensors, the required information includes the sensor's airflow transfer function. For MAP sensors, the required information includes the pressure-to-voltage calibration and applicable pressure range.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eConfigurations requiring custom firmware development or unsupported load-measurement strategies must be approved before purchasing.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eRemote Tuning Requirements\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eRemote tuning requires a compatible Siemens MS43 flashing interface and the ability to read, write, and datalog the ECU.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCustomers are responsible for providing accurate hardware information and completing requested datalogs throughout the calibration process.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFollowing purchase, please email your order number, current ECU file, and complete modification list to \u003c\/span\u003e\u003ca href=\"mailto:Michael.Leto@lrwtuned.com\"\u003e\u003cstrong\u003e\u003cspan\u003eMichael.Leto@lrwtuned.com\u003c\/span\u003e\u003c\/strong\u003e\u003c\/a\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eImportant Information\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThis is a custom calibration service, not a universal off-the-shelf tune. Each calibration is developed around the customer's individual engine and hardware configuration.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFinal power output and boost limitations depend on engine condition, supporting modifications, fuel quality, and hardware capabilities.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAll vehicles must be mechanically sound before tuning begins. Additional diagnostic work, hardware changes, or specialized calibration development may incur additional charges.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePlease review our Pre-Tune Checklist before beginning the tuning process.\u003c\/span\u003e\u003c\/p\u003e","brand":"Leto Race Werks","offers":[{"title":"2.5L (M54B25) \/ 91 \/ Launch Control","offer_id":68361648996603,"sku":null,"price":475.0,"currency_code":"USD","in_stock":true},{"title":"2.5L (M54B25) \/ 91 \/ Ignition Cut Limiter","offer_id":68361649029371,"sku":null,"price":475.0,"currency_code":"USD","in_stock":true},{"title":"2.5L (M54B25) \/ 91 \/ Both","offer_id":68361649062139,"sku":null,"price":500.0,"currency_code":"USD","in_stock":true},{"title":"2.5L (M54B25) \/ 91 \/ Neither","offer_id":68361649094907,"sku":null,"price":450.0,"currency_code":"USD","in_stock":true},{"title":"2.5L (M54B25) \/ 93 \/ Launch Control","offer_id":68361649127675,"sku":null,"price":475.0,"currency_code":"USD","in_stock":true},{"title":"2.5L (M54B25) \/ 93 \/ Ignition Cut Limiter","offer_id":68361649160443,"sku":null,"price":475.0,"currency_code":"USD","in_stock":true},{"title":"2.5L (M54B25) \/ 93 \/ Both","offer_id":68361649193211,"sku":null,"price":500.0,"currency_code":"USD","in_stock":true},{"title":"2.5L (M54B25) \/ 93 \/ Neither","offer_id":68361649225979,"sku":null,"price":450.0,"currency_code":"USD","in_stock":true},{"title":"2.8L (M52TUB28 - MS43 Swapped Only) \/ 91 \/ Launch Control","offer_id":68361649258747,"sku":null,"price":475.0,"currency_code":"USD","in_stock":true},{"title":"2.8L (M52TUB28 - MS43 Swapped Only) \/ 91 \/ Ignition Cut Limiter","offer_id":68361649291515,"sku":null,"price":475.0,"currency_code":"USD","in_stock":true},{"title":"2.8L (M52TUB28 - MS43 Swapped Only) \/ 91 \/ Both","offer_id":68361649324283,"sku":null,"price":500.0,"currency_code":"USD","in_stock":true},{"title":"2.8L (M52TUB28 - MS43 Swapped Only) \/ 91 \/ Neither","offer_id":68361649357051,"sku":null,"price":450.0,"currency_code":"USD","in_stock":true},{"title":"2.8L (M52TUB28 - MS43 Swapped Only) \/ 93 \/ Launch Control","offer_id":68361649389819,"sku":null,"price":475.0,"currency_code":"USD","in_stock":true},{"title":"2.8L (M52TUB28 - MS43 Swapped Only) \/ 93 \/ Ignition Cut Limiter","offer_id":68361649422587,"sku":null,"price":475.0,"currency_code":"USD","in_stock":true},{"title":"2.8L (M52TUB28 - MS43 Swapped Only) \/ 93 \/ Both","offer_id":68361649455355,"sku":null,"price":500.0,"currency_code":"USD","in_stock":true},{"title":"2.8L (M52TUB28 - MS43 Swapped Only) \/ 93 \/ Neither","offer_id":68361649488123,"sku":null,"price":450.0,"currency_code":"USD","in_stock":true},{"title":"3.0L (M54B30) \/ 91 \/ Launch Control","offer_id":68361649520891,"sku":null,"price":475.0,"currency_code":"USD","in_stock":true},{"title":"3.0L (M54B30) \/ 91 \/ Ignition Cut Limiter","offer_id":68361649553659,"sku":null,"price":475.0,"currency_code":"USD","in_stock":true},{"title":"3.0L (M54B30) \/ 91 \/ Both","offer_id":68361649586427,"sku":null,"price":500.0,"currency_code":"USD","in_stock":true},{"title":"3.0L (M54B30) \/ 91 \/ Neither","offer_id":68361649619195,"sku":null,"price":450.0,"currency_code":"USD","in_stock":true},{"title":"3.0L (M54B30) \/ 93 \/ Launch Control","offer_id":68361649651963,"sku":null,"price":475.0,"currency_code":"USD","in_stock":true},{"title":"3.0L (M54B30) \/ 93 \/ Ignition Cut Limiter","offer_id":68361649684731,"sku":null,"price":475.0,"currency_code":"USD","in_stock":true},{"title":"3.0L (M54B30) \/ 93 \/ Both","offer_id":68361649717499,"sku":null,"price":500.0,"currency_code":"USD","in_stock":true},{"title":"3.0L (M54B30) \/ 93 \/ Neither","offer_id":68361649750267,"sku":null,"price":450.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0739\/1454\/8475\/files\/2a297ab1-6cd8-448f-9655-fbff909895a8_e53868d6-81d1-4498-a8b2-b073342d456c.png?v=1792523038"}],"url":"https:\/\/lrwtuned.com\/collections\/ms4x-tuning.oembed","provider":"Leto Race Werks","version":"1.0","type":"link"}