When it comes to keeping your BMW G8X M3 (S58 engine) running at peak performance, overheating is simply not an option. Whether you're carving up back roads, dominating the track, or pushing your high-horsepower build to its limits, your cooling system needs to be as serious as your driving.
That is where CSF, the leader in BMW cooling, comes in. The CSF High-Performance Auxiliary Radiators are the latest addition to the Power Cooling Package, built to outperform and outlast the factory system. If you’re pushing serious power and demanding the absolute best cooling performance, this upgrade is your secret weapon against heat soak and limp mode.
Fitment Information
- BMW M3 G80 (2021, 2022, 2023, 2024, 2025)
- includes Competition & CS
- BMW M3 G81 (2022, 2023, 2024, 2025)
- includes Competition
Specs & Features
- Sold Individually: All applications use 2 auxiliary radiators
- Multi-Fit: Fits Both Left & Right Side
-
42mm 2-Row High-Performance Core: Increases cooling capacity and thermal efficiency.
-
5mm Multi-Louvered Fin Design: Expands heat exchange surface area for faster cooling recovery.
-
OEM-Style Quick Connect Fittings: Hassle-free installation, straight swap with factory connections.
-
Increased Tank Volume & Core Size: More coolant = better thermal management and longer heat soak resistance.
- TIG-Welded All-Aluminum Build: No plastic, no weak points—just pure strength and durability.
-
Includes Bolt-On Rock Guards: Protects against road debris and track hazards.
-
Leak & Pressure Tested: Every unit is tested to exceed OEM reliability standards.
-
Street, Track, and Race-Ready: Perfect for daily drivers, performance builds, and full-fledged race cars.
-
Stealth Satin Black Finish: Enhances durability while maintaining a factory+ aesthetic.
- 2-Year Limited Warranty: Backed by CSF’s reputation for quality and performance.
Product Description
When it comes to high-performance cooling for the BMW G8X M3 (S58 engine), CSF is the industry leader trusted by motorsports teams and enthusiasts alike. The CSF High-Performance Auxiliary Radiators are engineered to keep your S58 running cool even under extreme conditions, preventing heat soak, power loss, and dreaded limp mode. Whether you're hitting the track, upgrading your turbos, or pushing over 800HP+, your stock cooling system simply won’t cut it. CSF’s 100% all-aluminum, TIG-welded construction delivers maximum durability and cooling efficiency, while its larger 2-row 42mm core significantly increases fluid volume and heat dissipation. Featuring CSF’s exclusive B-Tube Technology and ultra-efficient 5mm fins, these radiators provide superior airflow, faster recovery from heat soak, and a longer-lasting cooling solution for serious street and track performance.
Designed as a true "drop-in fit" with OEM-style quick-connect fittings, installation is effortless—no modifications needed. Plus, the integrated bolt-on rock guards offer added protection against road debris, ensuring long-term reliability. Finished in a sleek satin black OEM+ look, these radiators blend seamlessly into your engine bay while delivering unmatched cooling performance. When the competition overheats, CSF keeps you cool under pressure—so you can push harder, drive longer, and get the absolute most out of your BMW. Upgrade with CSF today and unleash the full potential of your G8X!
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.More in this category
BMW M3 Parts
BMW M3 Radiators
CSF Performance Radiators
Reviews on this product
Ordering from Redline360
Redline360 is an Authorized Dealer so we only sell authentic and genuine parts and accessories.
Order updates, tracking and info
Our goal is your complete satisfaction. Upon ordering, you will receive an email confirmation of your order along with your invoice. You will be able to log into our website 24/7 to check on your order at any time. Your order is processed Monday through Friday from 8am to 6pm PST as soon as it is placed. Once your order ships, we will email you a tracking number so you can track your package.
Protect your purchase
Redline360 offers our customers piece of mind! We have partned with Extend to offer you Extend Product Protection and Extend Shipping Protection. Read about each protection that Extend offers to Redline360 customers!
Multiple distribution points ready to serve you!
We ship from multiple locations around the United States so you receive your part as quick as possible. Not every warehouse stocks all the same parts, so the closest warehouse to you that has the part in stock is where your order will ship from. We ship from California, Nevada, Indiana, Michigan, Florida, Texas and Pennsylvania.
Secure Ordering
We take security seriously! We are never exposed to your credit card information, and it's never stored. Credit card transactions go through the credit card processor directly. We also offer various other payment methods such as PayPal, Affirm Financing (Pay over time), Amazon Pay, Apple Pay and more!
Any non CARB compliant items can not ship California. We will notify you if we have to cancel your order.
Some products may be subject to local rules, laws and regulations in certain areas. Always check your local laws to determine legal restrictions. We are not responsible if you buy a product that is not legal in your area.
For items that have free shipping, free shipping only applies to the lower 48 states.
Questions? Contact us.
Actual item may vary from picture