When it comes to high-performance cooling, don’t settle for aftermarket options that reuse the OEM plastic rock guard. The OEM rock guard is designed for the original radiator core and can block airflow when paired with aftermarket radiators, reducing cooling efficiency. CSF went beyond industry norms, redesigning its included detachable aluminium rock guard to maximize airflow while providing excellent protection against rocks and debris. Proven in CSF’s in-house wind tunnel, this upgraded design ensures optimal cooling performance without compromise.
The CSF Auxiliary Radiator fits seamlessly on both the left and right sides of the vehicle with a true plug-and-play installation. Featuring CNC-machined mounting brackets and OEM-style “Quick Connect” connections, it requires no modifications—even when used with aftermarket aero upgrades.
Key Features and Benefits
- Improved Cooling Performance: 2-row, 42mm ultra-high-performance core with CSF's exclusive B-Tube technology.
- Redesigned Rock Guard: Industry-exclusive detachable aluminum rock guard maximizes airflow and provides superior protection.
- Durable Construction: 100% all-aluminum, TIG-welded build with thermal black protective coating for long-lasting performance.
- Perfect Fitment: Drop-in fit for both left and right sides with no modifications required.
- Proven Performance: Tested by leading tuners, race teams, and turbo kit manufacturers worldwide.
- OEM-Style Components: CNC-machined brackets and Quick Connect inlets/outlets for seamless integration.
- Warranty: Backed by a 2-year limited warranty.
Applications
The CSF Auxiliary Radiator is compatible with a wide range of BMW and Toyota GR Supra models, including:
- BMW G20 M340i / M340i xDrive (2020-2024)
- BMW G22/G23 M440i / M440i xDrive (2021-2024)
- BMW G42 M240i / M240i xDrive (2022-2024)
- BMW G29 Z4 M40i / sDrive30i (2020-2024)
- Toyota GR Supra (2020-2024), including 45th Anniversary and A91-MT Editions.
For full compatibility details, refer to the model list above.
Why Choose CSF?
Modern vehicles like the BMW M340i, M440i, and Toyota GR Supra demand efficient cooling to maintain peak performance. CSF’s Auxiliary Radiator ensures reduced intake air temperatures, consistent power output, and enhanced engine reliability—ideal for both track and street applications.
Upgrade to the CSF Auxiliary Radiator today and experience unmatched cooling performance for your BMW or Toyota GR Supra.
Unless explicitly stated otherwise, all products sold by R44 Performance Limited are designated RACE ONLY and are solely for competition or off-road use limited to racing formally sanctioned by a recognized racing organization. Any other use, including recreational off-road use, may violate local, state, and Federal laws. R44 Performance Limited does not implicitly or explicitly confirm the legality of using any products it sells on public roads; that is entirely the responsibility of the consumer.
It is the responsibility of the customer to check with all federal, state local and environmental laws before ordering and installing a product. R44 Performance Limited is not responsible for any fees, fines or costs that a customer may incur as a result of failing to check with federal, state, local or environmental laws before ordering and installing a product.
We get a large number of custom orders and requests everyday, so as a result it is not always possible for us to keep every item in stock at all times in our warehouse. If you require the item urgently please contact our sales team here to check the stock before you make your purchase.
We totally understand if you're not certain a part will be compatible with your car, so we highly recommend contacting us here with your query. Our friendly sales team will then be in touch to confirm if this part is the correct part you are looking for.
All in stock products ship the same day if ordered before 2pm GMT
For out of stock items we will contact you with an estimated wait time if not otherwise specified above.
We offer worldwide shipping on all products. If upon receiving your product you wish to return; we offer a 30-day returns policy. For our in-depth returns information please follow the link. "R44 Returns Policy
All of our products come with a standard warranty of 1-3 years. This is dependant on the type of product however. For more details please see our warranty page here.
PLEASE NOTE
- Orders with both in-stock and backorder or out-of-stock products will be dispatched once all products are available to ship together.
- Contact our sales team if you want your parts fitted to your vehicle at our London workshop.
- Shipping estimates are based on courier delivery times and don't include time to despatch from our warehouse.