B58 Cooling Upgrades Compared – Heat Exchanger, Auxiliary Radiator & Transmission Cooler

Racing Lab sells several different B58 cooling products, and they are not interchangeable. A heat exchanger, auxiliary radiator and transmission oil cooler each target a different part of the car’s thermal system. Understanding the difference makes it much easier to spend money on the part that actually matches your use case.

Shop products featured in this guide

These are current Racing Lab products directly related to the topic below.

RacingLab High-Performance Front Mount Heat Exchanger with Stone Guard - BMW G-Series & Toyota GR Supra A90/A91View product →RacingLab Auxiliary Radiator - BMW G-Series (B58) & Toyota GR Supra A90View product →RacingLab Transmission Oil Cooler - BMW G-Series (B58) & Toyota GR Supra A90View product →

Front mount heat exchanger: charge-cooling support

The B58 Front Mount Heat Exchanger supports the low-temperature cooling circuit used by the charge-air system. It is the product to look at when your main goal is improving heat rejection from the charge-cooling circuit during repeated high-load driving.

This makes it especially relevant to tuned BMW G-Series and Toyota GR Supra A90/A91 builds that see repeated acceleration or track sessions.

Auxiliary radiator: additional engine-cooling capacity

The B58 Auxiliary Radiator supports the broader cooling system. It is a different solution from the front heat exchanger and should be chosen based on the temperatures and conditions the car is actually experiencing.

Transmission oil cooler: a separate system

The automatic transmission creates its own heat during repeated acceleration, braking and gear changes. If transmission temperature is becoming the limiting factor during a session, the relevant product is the B58 Transmission Oil Cooler.

Upgrading engine or charge cooling does not replace the role of a dedicated transmission cooling solution.

Where the intake manifold fits

The B58 Intake Manifold is part of the charge-air side of the package. It becomes more relevant as the engine is tuned harder or used for longer periods under load.

How to choose the right order

For a road car, one targeted upgrade may be enough. For a track car, it is better to monitor intake, coolant and transmission temperatures and build the package around whichever system is reaching its limit first.

If you are planning a Supra, see the full Toyota GR Supra A90/A91 range. For BMW and Supra B58 cooling parts together, browse the B58 Performance & Cooling collection.

Keep the system balanced

The most expensive part is not automatically the most useful first step. A balanced system should match engine output, ambient temperature, session length and driving style. That approach is more useful than treating every B58 cooling component as if it solves the same problem.