[Dinan_Engineering]

Part Number(s): D780-0002
Applications:

• 2017-2021 F22/F23 M240i (& xDrive)
• 2016-2018 F30 340i (& xDrive)
• 2017-2019 F34 340i GT
• 2017-2020 F32/F33/F36 440i (& xDrive)
• 2017-2021 F22/F23 230i (& xDrive)
• 2016-2019 F30/F31 330i (& xDrive)
• 2017-2019 F34 330i GT
• 2017-2020 F32/F33/F36 430i (& xDrive)

Product Page(s) / Pricing: dinan.info/B58-B4X-F-HE
Release Date: Available Now!

Description: 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!

Features/Benefits:

• Average of 8° reduction in IAT's with a maximum reduction of 15° 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)

[Oem.plus]

Does it include a rock guard? It's been a common issue where rocks chip the heat exchanger which causes leaks.

[Dinan_Engineering]

Originally Posted by Oem.plus

Does it include a rock guard? It's been a common issue where rocks chip the heat exchanger which causes leaks.

Does not. Similar to the previous S55 heat exchanger and also the G chassis version releasing in the future, we haven't experienced any issues during extensive testing so it was decided that the additional cost (and subsequent raise in MSRP) was not warranted. That's not to say it can't happen but the view is that the possiblility is slim enough that penalizing the price for the entire market does more harm to adoption than good.