BMW Gen 1 B58 Supercore – M140i M240i 340i 440i 540i 740i

Unlock the performance of your BMW 40i with our B58 Gen 1 Supercore upgrade. It is engineered to deliver significant power gains while still maintaining OEM-level drivability. As a result, you get more speed without losing comfort.

This Supercore is designed specifically for early Gen 1 B58 engines found in the M140i, M240i, 340i, 440i, and Z4 40i. Therefore, fitment is perfect with no modifications required. It is the ideal upgrade for drivers who want more boost, more torque, and faster acceleration.

At the core of this turbo is a custom billet compressor wheel. In addition, it features a high-flow Inconel turbine shaft and upgraded bearings. Together, these components allow the turbo to move far more air than the factory unit. As a result, boost comes on harder and stays stronger through the entire rev range.

Unlike many big full-frame turbos, this B58 Supercore keeps the original exhaust housing. Because of this, it bolts directly to your engine like the stock turbo. You get faster spool, less lag, and factory-like drivability. At the same time, you gain a large increase in airflow and power.

Why Upgrade Your Gen 1 B58 Turbo?

The stock B58 turbo becomes a restriction once boost levels are raised. As power increases, exhaust backpressure and heat also rise. Because of this, performance quickly plateaus. However, this upgraded B58 Supercore removes those limits.

By improving airflow and reducing exhaust restriction, the engine can breathe more freely. Therefore, it runs cooler, makes more torque, and delivers more top-end power. In addition, reliability is maintained when paired with proper tuning.

Supercore: Turbo upgrade featuring +6mm billet compressor wheel and high flow 9 blade shaft. Capable of 500 bhp and designed for quick spool-up

Here is the article about B58 engines you might like: 👉 BMW’s B58: The Inline-Six That Refuses to Be Replaced

We also offer hybrid turbos for Gen 1 B58 models