CSF Performance Auxiliary Radiator 21+ BMW G8X

If you're pushing your BMW G8X M3, M4, or M2 to its limits, you know that keeping things cool is crucial. That's where CSF comes in. They've built a solid reputation in the BMW cooling game, and their latest release—the High-Performance Auxiliary Radiators—are a game changer for anyone serious about performance.

Now, the stock cooling system does its job decently well under normal conditions. But let’s be real: once you start cranking up the power or hitting the track hard, those factory parts start to struggle. That's when you need something that can handle the heat, and CSF has stepped up with these auxiliary radiators to keep your S58 engine running smoothly, even when the pressure's on.

Design & Engineering

What I love about these radiators is how easy they are to install. CSF designed them as a true "drop-in fit," meaning you can get them mounted without any major modifications. They slot right into the factory locations using the OEM quick connections, so you don't have to wrestle with complicated setups. Plus, they work seamlessly with the existing cooling system to keep those temps in check and extend your heat soak threshold. Trust me, there’s nothing worse than having to back off during a track session just because your car needs a cooldown lap.

When you compare these to the OEM units, the difference is night and day. The CSF radiators come with TIG-welded aluminum tanks that are not only larger for more fluid volume but also way tougher than the stock plastic ones. They feature a 2-row, 42mm core that significantly boosts cooling efficiency. Thanks to CSF's exclusive B-Tube technology and the latest 5mm fin design, airflow and heat dissipation are maximized. This means better performance and quicker recovery times, which is exactly what you want when you're pushing your car hard.

Durability is another key factor. With 100% all-aluminum construction, these radiators are built to last. The mounting pins and brackets are way sturdier than the factory setup, which gives you peace of mind when you're out there pushing your limits. And let’s not forget the sleek satin black finish—it looks great peeking through the grilles of your F8X.

For those of you who are really cranking up the horsepower—think over 1000 ponies—the S58 can run hot. If coolant temps spike too high, your G8X might go into limp mode, and that’s the last thing you want during a race or a spirited drive. CSF’s got your back, helping to keep your engine at peak performance.

Oh, and they’ve added integrated bolt-on rock guards to these radiators. If you’ve heard horror stories about OEM coolers getting punctured, you’ll appreciate this feature. Now you can have a bit more confidence that your cooling system won’t be compromised by road debris.

Features

• Sold individually—remember, you’ll need two for your setup.
• Multi-fit design that works for both left and right sides.
• 2-row, 42mm high-performance core with CSF's exclusive B-Tube technology.
• Ultra-efficient 5mm tall fins with a multi-louvered design for maximum surface area contact.
• Increased tank volume and core size for better cooling.
• 100% all-aluminum TIG-welded construction for durability.
• OEM-style quick connect inlet/outlet for easy installation.
• True drop-in fit—no modifications needed.
• Includes detachable rock guard for extra protection.
• Individually leak and pressure tested to ensure reliability.
• High-performance upgrade suitable for racing, street performance, or OEM replacement.
• Satin black finish for that OEM+ look.
• Comes with a 2-year limited warranty.

Fitment

• 2021+ BMW G80 M3 (including Competition & CS) - 6MT & ZF8 Auto
• 2021+ BMW G82/G83 M4 (including Competition, CSL, & CS) - 6MT & ZF8 Auto
• 2022+ BMW G81 M3 (including Competition) - 6MT & ZF8 Auto
• 2022+ BMW G87 M2 (including Competition) - 6MT & ZF8 Auto

So if you're serious about your BMW and want to keep it cool under pressure, these CSF High-Performance Auxiliary Radiators are worth considering. They’re designed for real-world use, and they’ll help you push your G8X to new heights without worrying about overheating.