Dinan High Performance Heat Exchanger - 2016-2021 BMW 230i/M240i/330i/340i/430i/440i


Part # D780-0002 Be the first to write a review

Dinan High Performance Heat Exchanger - 2016-2021 BMW 230i/M240i/330i/340i/430i/440i

In Stock
Free Shipping*
Add to Wishlist
Starting at $46 a month with Learn More


This part is legal under the provisions of EPA’s Tampering Policy dated November 23rd, 2020.

See Emissions Details
The factory B4x/B58 heat exchanger is not built to cater to the rigorous demands often associated with a modified build. The thin core is easily overwhelmed with IAT's rising dramatically once pushed beyond a few successive WOT pulls or even a few minutes at the track. This elevation in temperature gives way to the factory ECU fail safes pulling timing and reducing overall power in order to keep the system from overheating to the point of permanent damage. On an application where enjoyment is directly attributed to pushing the platform to its limits this constraint to cooling presents a challenge for the automotive enthusiast. The Dinan B4x/B58 heat exchanger for the F2x/F3x chassis assists in mitigating these issues with a more robust core (48mm thick Dinan core vs. 27mm thick OEM core) that wields 78% more heat transfer surface area for improved cooling capacity. The significant increase in core thickness requires unique "L" shaped end tanks to be incorporated as well, which also contributes to the overall thermal mass (ability to absorb, store, and release heat) improvement beyond the OEM setup. With up to a 15° IAT delta recorded over stock the Dinan heat exchanger is ready, and able, to assist in extending your vehicles ability to deliver maximum performance time and time again for your driving enjoyment!


  • Average of 8&deg reduction in IAT's with a maximum reduction of 15&deg over 15 successive WOT pulls
  • Reduces the tendency to heat soak / go in to limp mode
  • 48mm thick Dinan cooler vs. 27mm thick stock cooler
  • 78% more cooling surface area and volume than stock
  • 100% TIG welded and pressure tested
  • Installation hardware included (inclusive of xDrive specific transmission oil cooler brackets)
Brand Dinan
Dinan Point Value2
Emission Code7
Labor Time (Hours)4
Product TypeHeat Exchanger
Part NumberD780-0002

This part is legal under the provisions of EPA’s Tampering Policy dated November 23rd, 2020. The company has reasonable basis (test results) to verify that this product allows the vehicle to operate within legal emissions standards and is therefore legal to be sold for on-street use in all states that accept the legal provisions of the Clean Air Act and the EPA Tampering Policy. This product is NOT LEGAL FOR SALE OR USE IN THE STATE OF CALIFORNIA. Testing with the California Air Resources Board, in order to achieve 50-state compliance, is pending with CARB. Once testing is complete with California, and an E.O. number is issued, this product will be updated to 50-state legal status.
Due to the enlarged core and unique "L" shaped endtanks minor modification to the plastic core stack shroud may be required with some factory configurations ( particularly those with the optional OEM hot climate heat exchanger). Consult the installation PDF for full documentation on what exactly that entails.

Endurance Testing

Charge Air Temp Reduction, or Intercooler Temperature drop (Intercooler dT), is a measurement of the temperature drop across the intercooler (inlet temperature - outlet temperature). For this testing and data presentation, the measurement was taken at the end of each pull (~100mph WOT). The end of the pull was chosen as it generally represents the highest load on the charge cooling system. The charge cooling system has two parts, the intercooler and heat exchanger. The data shows that by implementing the Dinan heat exchanger, with the OEM intercooler, the charge cooling system pulls more heat from the intake air (lower IAT's) and performance decays slower (longer time on track before cooldown required).


    Your Review

    *Free Shipping & Handling only offered to the contiguous US on orders over $149, excludes clearance parts and oversized packages.

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