CSF BMW G Series | A90 | A91 Four piece cooling package

One of the most apparent problems for the 2nd gen B58 Motor is the liquid-cooled charge air cooler system quickly heat soaks with no ability to recover. This would cause the intake air temperatures (IATs) to spike, resulting in the ECU cutting the power output of the vehicle, and eventually putting the car into limp mode. CSF engineers witnessed the overheating issue first-hand as they were in attendance at the Global Time Attack Finals at Buttonwillow Raceway in November 2019. Several new heavily modified Supra racecars could barely go two or three laps in moderate ambient conditions without having the car go into limp mode, forcing drivers to take a cool down lap (or two), with some even coming into the pits to have their front mount heat exchangers sprayed down with cold water.

CSF's B58 high-performance heat exchanger will be a critical component to keeping your Supra/BMW's charge air cool, and out of limp mode. The upgraded heat exchanger is especially important when upgrading turbos and/or running performance tuning software. The original 2nd Gen B58 heat exchanger is a 1-row unit that is 25mm thick. In comparison, CSF has used its industry-exclusive world's largest 2-row core (68mm) with CSF's B-Tube technology. A unique tank design allows the larger CSF core to still fit into the OEM cooling system housing. The CSF improved design includes billet transmission cooler mounts, and metal rock guard with improved airflow characteristics. CSF is the only company to include a rock guard and incorporate OEM transmission cooler mounting points for a true plug-and-play "drop-in" fit.

Features

• Significantly Reduces Intake Air Temperature (IAT) for Maximum Performance (with Faster Heat Soak Recovery)
• Improves Air Flow to the Rest of the Cooling System for Both Lower Engine Coolant and Engine Oil Temperatures
• 2-Row, 42mm Ultra High Performance Core with CSF's Exclusive B-Tube Technology
• 2026 Update: New "Track-Spec" 5mm Tall Ultra Efficient Fins with a Multi-Louvered Design for Maximum Surface Area Contact and Heat Dissipation
• CNC Machined Mounting Brackets and OEM Style "Quick Connect" Inlet/Outlet
• 100% All Aluminum TIG-Welded Construction
• Includes Rock Guard & Transmission Oil Cooler Mounting Kit (Industry Exclusive)
• "Drop-in" Fit
• 2-Year Limited Warranty
• Smooth Satin Finish
• Tested and Proven by CSF's Global Network of R&D Partners, Including Leading Time Attack Teams, Tuners, and Turbo Kit Manufacturers

Don't be fooled by other high-performance aftermarket options that utilize the OEM plastic rock guard. The OEM rock guard's vertical channel design is specifically designed to only work with the tube spacing found on the OEM core. When the OEM rock guard is installed on an aftermarket radiator, it actually blocks a significant amount of surface area. Obviously this is detrimental to the intended performance.

During CSF's own R&D phase, CSF analyzed both the OEM and other aftermarket offerings and decided to go the extra mile. CSF redesigned the included rock guard to allow maximum flow to the radiator core, while still offering ample protection from small rocks and road debris — all proven on CSF's in-house wind tunnel. CSF's new Auxiliary Radiator fits both the left and right side of the vehicle as a drop-in fit, requiring no modifications to install. Each features CNC machined mounting brackets and OEM style "Quick Connect" inlet/outlet connections. This makes for a true plug-and-play installation that does not interfere with aftermarket performance aero modifications.

Features

• 2-Row, 42mm Ultra High Performance Core with CSF's Exclusive B-Tube Technology
• 2026 Update: New "Track-Spec" 5mm Tall Ultra Efficient Fins with a Multi-Louvered Design for Maximum Surface Area Contact and Heat Dissipation
• CNC Machined Mounting Brackets and OEM Style "Quick Connect" Inlet/Outlet
• 100% All Aluminum TIG-Welded Construction
• Includes Detachable Aluminum Rock Guard (Industry Exclusive)
• Finished in a Thermal Black Protective Coating
• Kit includes both Left & Right Side units
• 2-Year Limited Warranty
• Drop-in Fit Requires No Modifications to Install
• Tested and Proven by CSF's Global Network of R&D Partners, Including Leading Time Attack Teams, Tuners, and Turbo Kit Manufacturers

CSF is the world leader in cooling technology. From experience starting with the transmission in the BMW F8X M3, M4, and M2 Comp, CSF applied several different features exclusive to its manufacturing technologies.

During R&D, CSF consulted with a network of partners, including leading time attack teams, tuners, and more. Often, the feedback was gearbox fatigue and sluggish shifting with transmission temperatures overheating under prolonged or hard use.

CSF has the answer with our industry-leading transmission cooler for A90/91 Supra and BMW G-Series. Installed in most of the world's fastest A90 Supras & G-Series, including Titan Motorsports Drag Race Supra which was the first to reach the 8s in the 1/4 mile.

Design & Engineering

While the OEM Transmission Cooler is adequate for the A90/G-Series in stock form, it starts to come up short on modified/tuned vehicles. Specifically ones that see heavy track/competition use. Transmission oil temperatures have a major impact on the shifting performance of your automatic transmission.

If the fluid passes optimal temperatures you will start to see some delays in shifting. Sluggish shifting can be quite frustrating. However, the real concern is the damage that can be done to the transmission when temperatures get too high. There are often cases where drivers don't notice the change in shifting performance due to the gradual onset, but the damage is still being done slowly on a very expensive and important component.

Dual-Core Advantage

By changing from the OEM single core design to a dual core, CSF was able to increase the overall volume by 240%. This design offers a drastic improvement in heat dissipation and increases the fluid capacity of the coolers by 130%. 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.

OEM vs CSF

CSF's industry-exclusive dual-core design allows for maximum performance and the largest core volume oil capacity without affecting airflow into the rest of the cooling system. No more transmission temperature overheating or expansion tank overflow during racing conditions.

OE 32910-WAA02/17219494828 vs CSF #8183

Plug and Play Installation

CSF's High-Performance Transmission Cooler is designed as a drop-in fit to work with both the OEM Front Mount Heat Exchanger as well as CSF's High-Performance version (CSF #8154) with included rock guard. Also designed to utilize the OEM top/bottom rubber seals for optimal airflow into the cooling system.

⚠ Fitment Notes

The CSF #8183 will NOT fit the late production 2024 or 2025+ BMW G2X M340i or M440i models equipped with the B58N. Production of the B58D ended in 07/2024 for the M340i and 03/2024 for the M440i. You should physically check your OE Transmission Oil Cooler Part Number or call a BMW dealership with your VIN to check fitment compatibility.

BMW updated the part number for the Transmission Oil Cooler for the 2025 model. 2020-2024 models use the OE 17219494828, but the 2025+ uses the OE 17218852263.

2020-2024 models - 17219494828

2025+ models - 17218852263

Features

• Innovative Dual-Core Design (Industry Exclusive) vs. OEM Single Core — 240% Increase in Core Volume — 130% Increase in Fluid Capacity Compared to OEM (CSF 550ml vs. OEM 240ml)
• 5.4mm Tall Multi-Louvered Fin vs. OEM 7mm — Two 16mm Stacked Cores = 32mm Core Width (44mm Overall Width) vs. OEM 15mm Core Width — Rear Cooler: 15 Rows vs. OEM 12 Rows — Front Cooler: Additional 12 Rows
• 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
• 129mm Overall Height vs. OEM 125mm Allows for Maximum Performance Without Increasing Overall Surface Area or Blocking Airflow to Rest of Cooling System
• Utilizes OEM Top/Bottom Rubber Seals for Optimal Airflow
• OEM Style "Quick Connect" Inlet/Outlet Connections
• Drop-in Fit Requires No Modifications to Install
• Can be Installed With CSF's High-Performance Heat Exchanger (CSF #8154) or with the OEM Cooling System
• 2-Year Limited Warranty
• Ideal for Road Racing, Drag Racing, and Vehicles With Increased Performance and/or Transmission Tuning