ECU Remap BMW M140i, M240i, 340i & 440i (B58 Engine)

ECU Remap BMW M140i, M240i, 340i & 440i (B58 Engine)

Let’s be honest, you already own an icon. The M140i and its B58-powered siblings (M240i, 340i, 440i) are arguably the high-water mark for the modern 6-cylinder BMW. The B58 engine is an engineering masterpiece: incredibly smooth, devastatingly powerful, and famously over-engineered.

But have you ever planted your foot and felt that, even as fast as it is, BMW left an enormous amount of performance locked away? That, to protect the full-fat ‘M’ models, they put a “governor” on its true potential? You’re right. They did.

And here at MSL Performance in Birmingham, we have the key to unlock it. We’re not about generic, one-size-fits-all tunes. We’re about rolling up our sleeves and crafting a completely custom map, specifically for your B58 engine. It’s a bespoke suit for your engine – a perfect fit that delivers a new, savage level of performance, safely.

Find Your Perfect Level of Power

The B58 is a tuner’s dream. We’ve developed a clear path to take your car from a fast road car to an all-out supercar hunter.

Stage 1: The “M-Car Killer” Tune

This is the single greatest upgrade you can make to your car. On standard hardware, we meticulously recalibrate the engine’s brain to unleash the power this engine was always meant to have. The slight lag you feel? Gone. The mid-range pull? It’s transformed into a relentless, brutal shove that pins you to your seat. This isn’t just a remap; it’s a total transformation.

• The Result: A jaw-dropping gain of 80 bhp and a massive 100 lb-ft of additional torque.
• What you need: Just your car! No extra parts are required.

Stage 2: For When You Want to Make a Statement

Ready to chase down supercars? Stage 2 is where the B58 truly becomes the stuff of legend. By freeing up the exhaust with a high-flow downpipe, we can get far more aggressive with our custom tune, unlocking the engine’s full, unrestricted potential. The car pulls with savage intensity all the way to the redline, and the sound becomes that glorious, unapologetic straight-six roar that will make you smile every single time.

• The Result: A mighty 90-100 bhp gain over stock.
• What you need: A high-flow downpipe (decat or sports cat) is essential. An upgraded intercooler or charge cooler is also highly recommended to maintain consistent power.

So, Why Come to MSL?

Because we’re just as passionate about your car as you are. We believe tuning is an art form, and we take pride in every single car that rolls out of our workshop. When you bring your BMW to us, you’re not just getting a remap; you’re getting the full MSL experience – honest advice, expert workmanship, and the peace of mind that your pride and joy is in the safest hands.

Ready to feel the difference? Give us a call or drop by our workshop here in Birmingham. We’d love to have a chat about your car and figure out the perfect plan to unleash its true potential.