How much power can the stock B58 Engine handle?

Cars are a part of our everyday lives, and many of us dream of owning a powerful and exciting vehicle. If you're a car enthusiast or simply someone who appreciates a good engine, you've probably heard of the stock B58 engine.

This powerful engine is found in various BMW models, and it's known for its impressive performance capabilities. But how much power can it really handle in its stock form? Now let us get started and learn.

The Powerful B58 Engine

The stock B58 engine is a 3.0-liter turbocharged inline-six engine that is used in several BMW models, including the 340i, 440i, and even the Toyota Supra.

It's a powerful little engine that packs a serious punch, delivering impressive power and performance right out of the factory.

Power Straight from the Factory

So, how much power can the stock B58 engine handle? Well, straight from the factory, this engine is rated at around 320 horsepower and 330 lb-ft of torque.

That's a lot of power for a stock engine. This means that even without any modifications, the B58 can provide a thrilling driving experience with plenty of acceleration and speed.

However, There is Still More

While the stock power figures are already impressive, many car enthusiasts wonder if the B58 engine can handle even more power. The answer is yes, but with some modifications and upgrades.

Modifying the B58 Engine

Just like with any other engine, there are various modifications that can be made to the stock B58 engine to increase its power output. Some popular modifications include:

  1. Upgraded Turbocharger: Replacing the stock turbocharger with a larger, more efficient unit can significantly increase power and boost pressure.
  1. Downpipes and Exhaust: Installing a less restrictive exhaust system can help the engine breathe better and reduce back pressure, resulting in more power.
  1. Tuning and Software Upgrades: Remapping the engine's computer software or installing a performance tune can unlock additional power by adjusting parameters like fuel delivery, ignition timing, and boost pressure.
  1. Intake and Intercooler Upgrades: Upgrading the intake system and intercooler can improve airflow and reduce heat buildup, which will allow the engine to produce more power safely.

Experimenting with the stock B58 engine's limits may seem appealing, but it is crucial to keep in mind that increased power puts additional strain on the engine's parts.

It is imperative that you modify your engine safely and under the supervision of qualified experts if you intend to increase its power.

To handle the extra power and guarantee a dependable and safe driving experience, you might need to upgrade other parts like the brakes, differential, and transmission.


The stock B58 engine found in various BMW models is a true powerhouse, delivering impressive performance straight from the factory.

With its turbocharged inline-six design, it can produce around 320 horsepower and 330 lb-ft of torque in stock form, which is more than enough for most driving enthusiasts.

However, for those seeking even more power, the B58 engine can be modified and tuned to produce well over 400 horsepower and, in some cases, even close to 500 horsepower.