BMW F-Chassis Gen 1 B58 High-Performance All-Aluminum Radiator

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CSF has over 5 decades of experience manufacturing radiators. So when it comes to keeping your engine cool and your Gen 1 B58 F3X/F2X running at its best, a CSF High-Performance All-Aluminum Radiator is the obvious choice. Designed to perform on the street or at the track, a performance radiator is a must-have for both high horsepower builds as well as race vehicles which need added cooling performance in motorsports environments.

CSF, the industry leader in high-performance BMW cooling, is the top choice for F3X and F2X owners who want more than just OEM reliability. Whether you're building a serious track machine or simply want a bulletproof upgrade, the new CSF High-Performance Radiator delivers unmatched durability and cooling efficiency for your Gen 1 B58 BMW.

Product Details

Design & Engineering

CSF has built a reputation for producing the best B58 cooling systems on the market. Backed by years of experience and input from customers, race teams, and development partners, CSF leads the industry in Gen 1 B58 cooling technology.

As more enthusiasts push the performance limits of F-Chassis BMWs, the factory radiator has started to show its age. Increased boost and upgraded turbos generate significantly more heat, and the stock system can struggle to keep up. Combined with the heat exchanger mounted in front of the radiator, engine coolant temps can get too hot, especially during track use which can trigger limp mode.

On top of that, OEM plastic radiators degrade over time. With clogged tubes, damaged fins, and a higher risk of cracked tanks or gasket failure, replacing the stock radiator becomes essential for long-term reliability and performance.

Key Design Features:

• 20-25% increase in heat transfer efficiency using CSF's exclusive 5mm fin technology
• Improved cooling performance to support high-boost, big-turbo builds
• All-aluminum construction for superior durability over OEM plastic tanks
• Designed to work seamlessly with factory or aftermarket heat exchangers
• Whether you're building a street sleeper or prepping for your next track day, CSF's Gen 1 B58 Radiator is engineered to handle the heat and then some.

CSF vs OEM

The original OE radiator from BMW is a plastic tank with a single row aluminum core design. While this is generally accepted as good quality and durable, there is always room for improvement. The 4.5mm fins on the OE radiator made the system fairly efficient for a factory unit. The core itself is one of the biggest limiting factors at only 34mm thick and a single cooling row.

The CSF radiator features the latest 5mm fin technology. These fins significantly increase the heat exchange surface area improving overall cooling efficiency and recovery while still maintaining good airflow. The core is much larger than the factory featuring 2-Row 42mm aluminum core. This both increases the fluid capacity of the radiator, and improves the cores ability to dissipate heat. CSF's Exclusive B-Tube Technology increases the heat transfer by approximately 15% over regular oval welded tubes. In addition, the super-efficient multi-louvered fins maximize airflow through the core for the best possible performance.

Feature	CSF	OEM
# Core Rows	2-Row	1-Row
Core Thickness	42mm	34mm
# Cooling Tubes	67	76
# Cooling Fin Rows	68	77
Fin Height	5mm	4.5mm
Core Material	Aluminum	Aluminum
Tank Material	Aluminum	Plastic
Construction	100% TIG Welded	Crimp on Gasket

5mm Core Upgrade

While the 6.5mm fin version performed extremely well in testing, CSF always seeks to offer the ultimate cooling solution. Before going into final production the design was updated to incorporate CSF's latest 5mm fin technology which was introduced at the end of 2023. This new core specification offers even more heat transfer area and thermal efficiency than the tested prototypes. CSF is confident this radiator is ready to take on the most demanding racing conditions in the world.

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⚠ Fitment Notes

The CSF #7089 was designed as a drop-in fit replacement for the BMW OE 17118482623 only. It will NOT replace the OE 17118652497 found on early F3X 340i/440i with build dates up to 07/2016. If you are unsure of which radiator you have, you can visually check (see below) or call a BMW dealership with your VIN to verify.

The CSF #7089 & OE 17118482623 have a single connection on the lower left hand tank for the auxiliary radiators. The OE 17118652497 has two connections for the auxiliary radiators. It may be possible to convert an early model vehicle that came with the OE 17118652497 using the newer coolant line setup, however this has not been verified.

CSF #7089 / OE 17118482623

OE 17118652497

CSF #7089 / OE 17118482623

OE 17118652497

Features

• 2-Row - 42mm Ultra-High-Performance Core
• Cooling Tubes with CSF's Exclusive B-Tube Technology
• New 5mm Tall Ultra Efficient Fins with a Multi-Louvered Design for Maximum Surface Area Contact
• CNC Machined Mounting Brackets and OEM Style Inlet/Outlet
• 100% All Aluminum TIG-Welded Construction
• Hand Brushed Satin Finish
• True Plug-and-Play "Drop-in Fit" Installation Requires Absolutely No Modifications
• Individually Leak and Pressure Tested
• 2-Year Limited Warranty

Applications

Year Range	Make	Chassis Code	Model	Trim	Engine / Trans / Etc	Notes
2017-2021	BMW	F22/F23	230i	-	Turbocharged 2.0L L4	-
2017-2021	BMW	F22/F23	230i xDrive	-	Turbocharged 2.0L L4	-
2017-2018	BMW	F3X	330i	-	Turbocharged 2.0L L4	See Fitment Notes
2017-2018	BMW	F3X	330i GT xDrive	-	Turbocharged 2.0L L4	See Fitment Notes
2017-2018	BMW	F3X	330i xDrive	-	Turbocharged 2.0L L4	See Fitment Notes
2016-2018	BMW	F3X	340i	-	Turbocharged 3.0L L6	See Fitment Notes
2017-2019	BMW	F3X	340i GT xDrive	-	Turbocharged 3.0L L6	See Fitment Notes
2016-2018	BMW	F3X	340i xDrive	-	Turbocharged 3.0L L6	See Fitment Notes
2017-2020	BMW	F3X	430i	-	Turbocharged 2.0L L4	See Fitment Notes
2017-2020	BMW	F3X	430i Gran Coupe	-	Turbocharged 2.0L L4	See Fitment Notes
2017-2020	BMW	F3X	430i xDrive	-	Turbocharged 2.0L L4	See Fitment Notes
2017-2020	BMW	F3X	430i xDrive Gran Coupe	-	Turbocharged 2.0L L4	See Fitment Notes
2017-2020	BMW	F3X	440i	-	Turbocharged 3.0L L6	See Fitment Notes
2017-2020	BMW	F3X	440i Gran Coupe	-	Turbocharged 3.0L L6	See Fitment Notes
2017-2020	BMW	F3X	440i xDrive	-	Turbocharged 3.0L L6	See Fitment Notes
2017-2020	BMW	F3X	440i xDrive Gran Coupe	-	Turbocharged 3.0L L6	See Fitment Notes
2017-2021	BMW	F22/F23	M240i	-	Turbocharged 3.0L L6	-
2017-2021	BMW	F22/F23	M240i xDrive	-	Turbocharged 3.0L L6	-

OEM Part Numbers

• BMW: 17118482623
• BMW: 17 11 8 482 623
• BMW: 17-11-8-482-623

Warranty

Cooling Systems and Flexibles, Inc. (CSF) warrants CSF’s High-Performance Cooling Systems, under normal use and service, to the original purchaser of the vehicle in which the product was originally installed. For more information and details please visit our Warranty Page

SKU# 7089 Warranty Term: 2 years