Dinan DINANFLASH Handheld Tuner for BMW B58 (M0) and B46 Engines 2016-2021

The Dinan 4431 DINANFLASH Handheld is a plug-in flash tuner for BMWs with the first-generation B58 (M0) 3.0L turbo six, such as the 340i, 440i, M240i, 540i and 740i, and for F-chassis cars with the B46 2.0L turbo four. Instead of an inline module, it rewrites the engine computer with Dinan's own calibration through the OBD-II port, from the driver's seat, in about half an hour. Dinan quotes up to +98 wheel horsepower and +120 lb-ft on the B58 and up to +84 wheel horsepower and +121 lb-ft on the B46, depending on the fuel you choose.

Dinan's software goes beyond a boost bump. It rescales the maps for boost control, cam phasing, fueling, airflow and temperature management, keeps BMW's own engine protections in place and adds Dinan safeguards on top, and removes the factory top-speed limiter. You pick a map matched to the fuel in the tank: 91, 93 or 100 octane, plus a 104 octane map on B46 cars. Never run a lower grade than the map calls for. A Stock setting returns the car to the factory calibration before dealer service.

The handheld has a 2.8-inch color screen and doubles as a gauge and diagnostic tool: it can read and clear fault codes, show live data and log up to eight parameters, four at a time on screen. It can be used on more than one VIN, paired to one car at a time. Software updates are free for life through Dinan's Update Agent tool; Dinan recommends updating the unit when it arrives. Some B58 box codes are new to Dinan, in which case the handheld asks you to connect to a computer and Dinan builds a file, usually within 24 to 48 hours. DINANTRONICS Elite owners may qualify for a discounted upgrade from Dinan.

Emission code 7: Dinan sells it under the EPA's November 2020 tampering policy, and it is not legal for sale or use on pollution-controlled vehicles in California (CARB testing is pending). Dinan covers the handheld with its limited 1-year warranty; as a do-it-yourself tune it is used at your own risk, and Dinan's vehicle-matching powertrain warranty does not apply. DINANFLASH Handheld user manual (PDF) and DINANFLASH Handheld FAQ (PDF).

Features

• At-home OBD-II ECU flashing
• Up to +98 whp / +120 lb-ft on B58 (M0) (Dinan)
• Octane-specific maps plus return-to-stock
• Read/clear codes, gauges and data logging
• Top-speed limiter removed
• Free lifetime software updates

What's Included

• Dinan DINANFLASH handheld tuner kit (4431)

Specifications

Questions about fitment? Call (310) 231-0292 or text (310) 886-3111.

Fitment Notes

• B58 (M0, first generation) and F-chassis B46 only; later B58TU cars are not covered.
• X3 / X4 M40i 2019: call to confirm (Dinan's chart lists "X3 M / X4 M").
• B46 F-chassis rows follow Dinan's product name: call to confirm your car.
• Not legal for sale or use in California.