If you’re diving into the world of BMW tuning, you’ve probably heard about CSF and their solid reputation in the cooling game. They've really made a name for themselves, especially with the B58 engine. As these Gen 1 B58 models gain traction in the tuning scene, the demand for reliable cooling solutions has shot up. That’s where CSF steps in with their new High-Performance Auxiliary Radiators, designed specifically for the F87 M2 (N55), F3X 340i/440i, and F2X M240i/M140i.

Now, let’s be real: the stock cooling systems on these BMWs do a decent job under normal conditions. But once you start cranking up the power and pushing your car hard, you’ll notice those factory parts can struggle to keep up. That’s why CSF’s auxiliary radiators are a game changer. They’re built to handle the heat when you’re really pushing your M2 or B58 to its limits.

So, what makes these radiators stand out? For starters, they come with a robust 2-row, 42mm high-performance core featuring CSF's exclusive B-tube technology. This isn’t just marketing fluff; it means better heat dissipation when you need it most. The new ultra-efficient fins are 5mm tall and have a multi-louvered design that maximizes surface area contact, so you’re getting the most out of every square inch.

Installation is a breeze too. These radiators are designed as a true "drop-in fit," meaning no modifications are necessary. Just pop them in, and you’re good to go. Plus, they’re made from 100% all-aluminum with TIG-welded construction, so you know they’re built to last. Each unit is individually leak and pressure tested, giving you peace of mind whether you’re hitting the track or just cruising around town.

And let’s not forget the aesthetics. With a satin black finish, they’ll blend right in for that OEM+ look. They come with a detachable rock guard, which is a nice touch for those of us who like to take our cars off the beaten path. Plus, you get a 2-year limited warranty, so you can drive with confidence.

These radiators are suitable for a range of models, including:

• BMW F87 M2 (2016-2018)
• BMW F3X 340i (2016-2019)
• BMW F3X 440i (2017-2020)
• BMW F3X 430i (2017-2020)
• BMW F2X M240i (2017-2021)
• BMW F2X M140i (2016-2019)

Just a heads up for specific fitment: if you have a 2016-2018 BMW F87 M2 (N55), you’ll need one for the left-hand side. And if you’re rolling in a 2016-2019 BMW F3X 340i (including xDrive), these radiators will fit right in without a hitch.

In short, if you’re serious about performance and keeping your engine cool, these CSF Auxiliary Radiators are worth considering. They’ll help you push the limits without worrying about overheating.