B58 Bmw M240i
BMW is updating its B58 six-cylinder engine for the M240i, M340i, and M440i. Power rises to 386 hp with more torque, while fuel consumption drops. Here's what's new for November 2025.
The BMW B58 is a turbocharged straight-six engine, which began production in 2015. [1] The B58 replaced the N55 and was launched in the F30 340i. [2] The B58 is part of BMW's modular engine family, each engine using a displacement of 500 cc (30.5 cu in) per cylinder, following the B38 and B48 engine.
[3] The B58 engine was named to Ward's World's 10 Best Engines five times, in 2016 (installed. 2025 M240 B58 Variant TU1 or TU2? All times are GMT -5. The time now is 02:27 AM.
BMW upgrades B58 3.0-liter TwinPower Turbo straight-six; M340i now gets 392. This B58-powered BMW M240i xDrive coupe can run the quarter-mile in just 7.9 seconds at 175 mph, making it the quickest BMW on the planet. The ARM M240i Midpipe significantly improves the sound of your B58, giving it the aggressive exhaust note you're looking for from a tuned B58-powered BMW.
Designed to amplify the power and sound of your B58, the ARM M240i Midpipe eliminates the two central resonators found in the stock M240i midpipe. By retaining the OEM muffler you still have the ability to control the volume of your exhaust. Does the 2017 M240i have a B58? The M240i picks up where the previous M235i left off, with a similar combination of the virtues of a big engine in a small car.
As indicated by the new car's badge, the engine has been upgraded to the same B58 generation inline-six that BMW uses in the 340i, but it has been tweaked to deliver slightly more power. BMW M240i Another stylish coupe, the compact rear-wheel drive M240i delivers 335 horsepower care of a B58 underhood. Agile like a sports car yet comfortable when needed, it hits 60 mph in 4.3 seconds despite its small footprint.
BMW 540i Slotting in above the mainstream 5 Series models, the athletic BMW 540i entices drivers with a smoother, more luxurious take on the B58 straight six. Its. For model year 2026, the M240i carries a starting price of $53,000 with rear-wheel drive in the US market.
Selecting xDrive adds 2,000 dollars to the final price, and freight adds 1,175 bucks. We recently had this awesome brand new 2025 BMW M240i xDrive in for an installation of our tuning module. We've conducted extensive development on the 3.0 B58, so already know it's tuning capabilities.
After a quick installation of our 3 channel module, the driver was back out, already experiencing those instant performance increases.