BMW F9X X3M / X4M Performance Cooling Module (Heat Exchanger + Trans Cooler)

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The F97 X3M and F98 X4M are powered by the same S58 engine found in the G8X M3, M4, and M2. These SUVs are capable of massive power and incredible speeds. However, they stuffer from the same heat issues as their Sedan and Coupe cousins. CSF's Cooling Systems have become core upgrades for S58 owners, even ones keeping the engine mostly stock.

Many owners have been upgrading their X3Ms and X4Ms with the CSF "Level Up" Charge Air Cooler Manifold for years now. The fastest examples are all running the CSF Manifold and have been asking for more cooling upgrades. After over a year of development and testing, CSF is pleased to offer the Front Mount Heat Exchanger & Transmission Cooler Module for the F9X X3M / X4M.

Product Details

Design & Engineering

CSF began designing the Heat Exchanger for the X3M/X4M using all the experience and data gathered from the entire G8X Cooling Suite. The first hurdle in designing a Front Mount Heat Exchanger for these vehicles was the space constraints. The X3M and X4M use a different transmission oil cooler than the G8X models that restricted increasing the size of the Heat Exchanger due to the mounting cradle. After testing a few smaller core options, CSF determined it made more sense to combine the Heat Exchanger with a Transmission Cooler Upgrade to maximize size and performance.

By combining the Heat Exchanger and Transmission Cooler into a full cooling module, CSF was able to run the same size core as the G8X Heat Exchanger. The Auto Transmission Cooler uses the same dual core design as the G8X Transmission Cooler which is fitted to the new Heat Exchanger. This creates a cooling module that comes as a single unit. The combination not only solves two cooling issues for the X3M and X4M, but also lowers costs which are passed along to the customer.

OEM vs CSF

Both the Heat Exchanger and Transmission Cooler are significant upgrades when compared to the factory Units.

Heat Exchanger

The TIG welded aluminum tanks are much larger than the OE plastic tanks offering superior strength and fluid volume. A larger 2-row 42mm core increases cooling efficiency and capacity. This high efficiency core uses CSF's Exclusive B-Tube Technology, maximizing airflow and heat dissipation. CSF's multi-louvered fins significantly increase the heat exchange surface area improving overall cooling efficiency and recovery while maintaining proper airflow.

100% All-Aluminum construction ensures the best performance and durability. The mounting tabs and brackets are much stronger and more durable than the OE plastic design. In addition, the Heat Exchanger also features an integrated bolt on rock guard to keep the cooler safe. This rock guard is metal and much more robust than the factory plastic rock guard. Now you can feel more confident that your cooling system is safer from debris.

Feature	CSF	OEM
Core Width	42mm	28mm
Core Rows	2-Row	1-Row
Fin Height	6.5mm	6.3mm
Tank Material	All-Aluminum	Plastic
Construction	100% TIG-Welded	Crimp on Gasket

Transmission Cooler

The CSF Transmission Cooler features a unique dual pass design to maximize cooling performance. You can see in the diagram below how the OEM Cooler's dual pass design works by flowing across the lower half of the core and back through the top half. This is how traditional dual pass systems work and is perfectly functional. The CSF Front to Back stacked core design more than doubles surface area and almost triples the core volume.

The engineers at CSF came up with this unique design to take advantage of the extra space originally taken up by the OE Cooler and oversized plastic cradle. This design essentially doubles the cooling capacity while still fitting perfectly in the OEM position with no modifications necessary.

Feature	CSF	OEM
Core & Tank Dimensions	527mm (W) x 188mm (H) x 44mm (D)	554mm (W) x 87mm (H) x 30mm (D)
Tubes & Fin Rows	15 Tubes & 16 Rows	8 Tubes & 7 Rows
Fin Height	8mm	8mm
Design	Dual Core Dual Pass (front to back)	Single Core Dual Pass (Bottom to Top)

Dual-Core Advantage

By changing from the OEM single core design to a dual core, CSF was able to increase the overall volume by 201%. This design offers a drastic improvement in heat dissipation and increases the fluid capacity of the coolers. Utilizing CSF's AC Condenser Technology, a 1-Row Super-High Pressure 16mm 9-Channel Microtube design optimizes oil flow and offers maximum surface area contact. These features combine to offer the best possible heat dissipation from the system.

Rock Guard

CSF knows the kind of punishment the front of a car can take on or off the track. The wrong bit of debris flying through the front grille can quickly punch a hole in a cooler. Because the Transmission cooler sits at the very front of the center cooling stack, it is quite vulnerable to damage.

The factory grille is the only form of protection for the OEM transmission cooler. However, this still isn't the level of protection many race teams and enthusiasts are comfortable with. To address this concern, CSF has incorporated a rock guard to keep your cooler safe and your X3M/X4M running strong in the event of debris making it through the front grille.

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Testing and Install with Made Motorsports

MADE Motorsports in Las Vegas are one the most popular B58 & S58 tuning shops in Nevada. They're reputation has drawn a lot of customers from California and Arizona as well. They picked up an 2022 X3M Competition in 2023 and immediately began modifying it. Having used the CSF S58 Charge Air Cooler Manifold on other G8X builds, they quickly got one installed along with upgraded turbos. CSF worked with the team there to start testing prototypes and refining the design.

With the production version complete, CSF paid a visit to MADE Motorsports for the final test installation. Everything fit beautifully and their X3M has never run better.

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⚠ Fitment Notes

LCI G01 X3 M40i LCI & G02 X4 M40i & Late Production Pre-LCI

The CSF #8331 fits the G0X X3 & X4 M40i LCI models and Pre-LCI models built after 08/2019 with the B58D engine (verify build date with your VIN). The heat exchanger is a direct replacement for the OE Heat Exchanger (BMW 17-11-9-468-695). While the CSF Module’s Transmission Oil Cooler is not a direct replacement for the OE Transmission Oil Cooler (BMW 17-21-9-487-254), it connects to the OE lines and mounts directly to the CSF Module’s Heat Exchanger. Installation may require very minor adjustments to the positioning of the lines/connections.

Pre-LCI G01 X3 M40i LCI & G02 X4 M40i

Pre-LCI G0X X3/X4 M40i models produced before 08/2019 did not come with an air-to-air external transmission oil cooler (verify build date with your VIN). They used a liquid-to-oil cooler mounted in the engine bay. This means the Transmission Oil Cooler cannot be connected without modifications.

To connect the CSF Transmission Oil Cooler to an early model M40i, you will need to use the factory thermostat and lines from a model built after 08/2019 or use a universal AN setup.

Factory Parts Option:

No.	Description	Note	Qty	Part Number
2	Transmission oil cooler line, flow		1	17-22-8-672-935
3	Transmission oil cooler line, return		1	17-22-8-837-517
4	Bracket, oil cooler line		1	17-22-9-494-187
5	ASA screw, self-threading	M6x16	1	34-50-9-804-151
6	Top shell for holder		3	17-22-8-699-987
7	Bracket transmission oil cooler line		1	17-22-7-936-454
8	Torx bolt	M8x25 8.8 ZNS3	1	07-11-9-908-535
9	Bracket for coolant line		1	17-22-7-936-450
10	ASA-Bolt	M6x16-ZNNIV SI	1	07-11-9-907-573
11	Thermostat		1	17-22-8-678-822
12	Hex bolt	M6x25 UD15	2	17-22-8-678-827
13	O-ring	13.94 x 2.62	4	17-22-7-613-656

You will also need to decide what to do with the original transmission oil cooler. You can leave it in place if the lines are able to run around or past it. However, if you choose to remove it you will need to connect the coolant lines running to the cooler with each other to create a loop (see diagrams below). The simplest way to do this is to remove the connections off each side that connect to the cooler and join with a barbed hose connector.

Aftermarket AN Option:

You will need to source several components and CSF does not make any specific recommendations on this setup as it will be custom and not tested. Parts you will need include, but are not limited to the following:

• 8HP to AN-8 or -10 Transmission Cooler Adapter
• AN-8 or -10 Lines and Fittings rated for Transmission Fluid
• Thermostat
• Adapter setup to connect to the BMW style transmission oil cooler connectors

This has been done by a shop in Europe but exact part details were not given.

CSF cannot offer any technical support if you pursue this option.

Features

• Significantly Reduces Intake Air Temperatures (IATs) for Maximum Performance (with Faster Heat Soak Recovery)
• Improves Air Flow to the Rest of the Cooling System for Lower Engine Coolant Temperatures
• Heat Exchanger: 2-Row - 42mm Ultra-High-Performance Core
• Heat Exchanger: 6.5mm Tall Multi-Louvered Fin with CSF's Exclusive B-Tube Technology
• Heat Exchanger: Upper Rock Guard and Transmission Cooler Mounting Kit
• Heat Exchanger: Hand Brushed Satin Finish
• Transmission Cooler: Dual-Core Design - 201% Increase in Core Volume
• Transmission Cooler: Made with CSF's AC Condenser Technology Using a 1-Row Super-High Pressure 16mm 9-Channel Microtube for Optimal Oil Flow and Maximum Surface Area Contact
• Transmission Cooler: Pre-installed foam strips for increased sealing
• CNC Machined Mounting Brackets and OEM Style "Quick Connect" Inlet/Outlet
• 100% All Aluminum TIG-Welded Construction
• True Plug-and-Play "Drop-in Fit" Installation Requires Absolutely No Modifications
• 2-Year Limited Warranty

Applications

Year Range	Make	Chassis Code	Model	Trim	Engine / Trans / Etc	Notes
2020-2024	BMW	F97	X3	M	Turbocharged 3.0L L6	-
2020-2024	BMW	F97	X3	M Competition	Turbocharged 3.0L L6	-
2020-2025	BMW	F98	X4	M	Turbocharged 3.0L L6	-
2020-2025	BMW	F98	X4	M Competition	Turbocharged 3.0L L6	-

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⚠ Fitment Notes

LCI G01 X3 M40i LCI & G02 X4 M40i & Late Production Pre-LCI

The CSF #8331 fits the G0X X3 & X4 M40i LCI models and Pre-LCI models built after 08/2019 with the B58D engine (verify build date with your VIN). The heat exchanger is a direct replacement for the OE Heat Exchanger (BMW 17-11-9-468-695). While the CSF Module’s Transmission Oil Cooler is not a direct replacement for the OE Transmission Oil Cooler (BMW 17-21-9-487-254), it connects to the OE lines and mounts directly to the CSF Module’s Heat Exchanger. Installation may require very minor adjustments to the positioning of the lines/connections.

Pre-LCI G01 X3 M40i LCI & G02 X4 M40i

Pre-LCI G0X X3/X4 M40i models produced before 08/2019 did not come with an air-to-air external transmission oil cooler (verify build date with your VIN). They used a liquid-to-oil cooler mounted in the engine bay. This means the Transmission Oil Cooler cannot be connected without modifications.

To connect the CSF Transmission Oil Cooler to an early model M40i, you will need to use the factory thermostat and lines from a model built after 08/2019 or use a universal AN setup.

Factory Parts Option:

No.	Description	Note	Qty	Part Number
2	Transmission oil cooler line, flow		1	17-22-8-672-935
3	Transmission oil cooler line, return		1	17-22-8-837-517
4	Bracket, oil cooler line		1	17-22-9-494-187
5	ASA screw, self-threading	M6x16	1	34-50-9-804-151
6	Top shell for holder		3	17-22-8-699-987
7	Bracket transmission oil cooler line		1	17-22-7-936-454
8	Torx bolt	M8x25 8.8 ZNS3	1	07-11-9-908-535
9	Bracket for coolant line		1	17-22-7-936-450
10	ASA-Bolt	M6x16-ZNNIV SI	1	07-11-9-907-573
11	Thermostat		1	17-22-8-678-822
12	Hex bolt	M6x25 UD15	2	17-22-8-678-827
13	O-ring	13.94 x 2.62	4	17-22-7-613-656

You will also need to decide what to do with the original transmission oil cooler. You can leave it in place if the lines are able to run around or past it. However, if you choose to remove it you will need to connect the coolant lines running to the cooler with each other to create a loop (see diagrams below). The simplest way to do this is to remove the connections off each side that connect to the cooler and join with a barbed hose connector.

Aftermarket AN Option:

You will need to source several components and CSF does not make any specific recommendations on this setup as it will be custom and not tested. Parts you will need include, but are not limited to the following:

• 8HP to AN-8 or -10 Transmission Cooler Adapter
• AN-8 or -10 Lines and Fittings rated for Transmission Fluid
• Thermostat
• Adapter setup to connect to the BMW style transmission oil cooler connectors

This has been done by a shop in Europe but exact part details were not given.

CSF cannot offer any technical support if you pursue this option.

OEM Part Numbers

• BMW: 17-11-9-468-695
• BMW: 17 11 9 468 695
• BMW: 17119468695
• BMW: 17-11-8-693-360
• BMW: 17 11 8 693 360
• BMW: 17118693360

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# 8331 Warranty Term: 2 years