Dinan + Performance Engine Software - 2015-2020 BMW M2C/M3/M4


PART# D900-S55-S1-W-HE


Dinan has a long and storied past when it comes to engine tuning having introduced our first engine performance chip in the mid 80's - over 3 decades ago. From those early years with chips, followed by engine software and then to our own external control modules we have become experts in nearly every possible way to extract safe, reliable power from the factory powerplant. While we have long preferred the unheard of control and sophistication capable of being achieved from engine software, over the past 6 years that option was not one afforded to us. That changes now with the re-introduction to flash tuning for Dinan with the S55 engine. The first of the next generation of Dinan flash tunes, the S55 calibrations are held to the same principles of the past; performance, reliability, and safety. Dinan performance engine software is so much more than just turning up the turbo boost after all. It is a fully re-tuned engine management program that maximizes power while keeping all the BMW factory safeguards in place. Protecting your BMW while giving the most performance is the definition of "Performance Without Sacrifice". Drivetrain and engine components are analyzed for strength then the calibration is tested on the dyno and in the real world for durability and drivability. This next generation of Dinan flash tunes does differ from the past however in that there are many different options to choose from depending on your needs or desires. Whether you want a warranted tune for 93 pump gas when under the factory warranty, an E85 performance tune for maximum performance when outside of the factory warranty or something in between, chances are Dinan has an option for you. Maximum performance with a warranty; the Dinan +HE Performance engine software is designed for the S55 engine coupled with the Dinan heat exchanger (D780-0001A) and yields more power, improved drivability while also removing of the factory speed governor for maximum enjoyment. Dinan + variants of engine software also carry the infamous Dinan 4yr / 50k, factory matching warranty that the brand is synonymous with.


  • More Power: Max gains of 80 HP / 88 lb-ft of torque over stock on the F87 M2C and 68 HP / 80 lb-ft of torque over stock on the F8x M3/M4. Consult the performance charts for detailed data
  • Factory matching warranty coverage (4year / 50,000 mi), including the possibility of consequential damages
  • Calibrated to work exclusively with pump gas (91 and 93 octane)
  • Requires the Dinan heat exchanger (D780-0001A) to retain warranty coverage and to realize advertised power gains
  • Full map rescaling for drivability from idle to wide open throttle and everywhere in between
  • Top speed governor removed
  • Upgradeable from DINANTRONICS - See the Purchase Guide or FAQ linked below for details
  • Retains all BMW factory engine damage safeguards
  • Torque gains drastically improve acceleration
  • No hesitation between shifts
  • Downloads through the OBD2 Port - See compatability notice at the bottom of the product page
  • Hassle free operation — Install and enjoy


Dinan Point Value3
Emission Code4
Factory Rated HP405 - 425 (441-480 Measured)
Factory Rated Torque (lb-ft)406 (441 Measured)
Labor Time (Hours)0.5
Max HP Gain90 @ 5500 RPM (M2C); 75 @ 4500 RPM (M3/M4)
Max Torque (lb-ft) Gain97 @ 4500 RPM (M2C); 88 @ 4500 RPM (M3/M4)
Peak HP514 @ 6500 RPM (M2C); 514 @ 6500 RPM (M3/M4)
Peak HP Gain62 @ 7000 RPM (M2C); 23 @ 7000 RPM (M3/M4)
Peak Torque (lb-ft)522 @ 4500 RPM (M2C); 522 @ 4500 RPM (M3/M4)
Peak Torque (lb-ft) Gain49 @ 3000 RPM (M2C); 78 @ 4000 RPM (M3/M4)
Product TypeEngine Software
Required ItemsDinan Heat Exchanger (D780-0001A).
WarrantyDinan Factory Matching (4yr/50k) Warranty
Part NumberD900-S55-S1-W-HE



This part is legal for sale or use on Racing Use Only Vehicles

The following vehicles are considered Racing Use Only Vehicles:

  • Racing Use Only Vehicles are vehicles that are used exclusively for competition that are not registered and that may never be used on the street

WARNING: It is against the law to install this part on an Emissions Controlled Vehicle

Dinan +HE Performance Charts

PlatformSelect Graph Type


DME box code and bootloader information must be obtained from the vehicle to determine if a vehicle is flashable in its current state. In some cases we will need to create a file for your vehicle. This process could take several days and multiple dealer visits. 

Vehicles previously serviced or updated after June of 2019 may have received a DME bootloader update from BMW. This bootloader version will prevent the Dinan software upgrade from completing. DMEs with the updated bootloader must be removed from the vehicle, and sent to Dinan HQ to have the bootloader backdated. DMEs sent to Dinan for the backdating procedure will not be opened or physically modified in any way. Once the DME is returned to the dealer, they must still be flashed with the Dinan performance software through the OBDII port. If a previously backdated and flashed ECU is updated with the new bootloader, the above process will need to be repeated. Dinan will not pay labor under warranty to remove and reinstall ECUs that were previously backdated, and then updated by BMW or a third party.

Tech Resources

Requires Dinan S55 Heat Exchanger (D780-0001A). See compatibility notice at the bottom of the product page for information on potential limitations to an OBD2 flash.

Warranty Information

Dinan Factory Matching (4yr/50k) Warranty: See Details


We Suggest

    *Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages.

    Some parts are not legal for use in California or other states with similar regulations.