BMW just gave journalists their first real seat time in the combustion-engine half of the next-generation 3 Series, and the headline number is out: the new range-topping BMW M350 xDrive makes 437 hp (443 PS in Europe) from an updated B58 turbocharged inline six, backed by 48V mild hybrid assistance. BMW brought press to its Miramas proving grounds in southern France — the same facility used for final validation before a car reaches production — to sample the car across four completely different driving environments before its design goes public.
Key Takeaways
- 437 hp and 428 lb-ft. The BMW M350 xDrive tops the ICE lineup with a 3.0-liter B58 six good for 0-62 mph in a claimed 4.1 seconds.
- Drift Moment arrives in 2027. A rear-drive-only mode that sends full engine torque to the back wheels, delivered via over-the-air update to every M350 — including cars already in driveways.
- Everything was retuned, nothing carried over untouched. New tires, new steering tuning, new suspension, and modified axles front and rear versus the outgoing M340i.
- Standard adaptive M suspension. For the first time, the M350 doesn’t offer a lesser suspension option — every car gets the top setup.
A Chassis Built From M340i Owner Feedback
BMW says the M350’s development targets came directly from M340i owner surveys: more comfort, steering that felt less nervous off-center, and a car that still delivers on the sporty end without sacrificing everyday livability. Engineers drew a hard line around Sport Plus mode specifically — the goal was to improve the car everywhere else without touching the character that made people buy the M340i’s top trim in the first place.
The car keeps an updated version of the outgoing 3 Series’ CLAR platform, internally coded G50, rather than the all-new architecture underneath the electric BMW i3 it will be sold alongside. The wheelbase grows by 9mm, and the front and rear tracks widen slightly too. Tire sizes are up across the board — 245-section fronts and 275-section rears on 20-inch wheels, the largest wheel-and-tire package BMW has ever fitted to an M Performance 3 Series — and for the first time, adaptive M suspension is standard equipment rather than an option, alongside a controlled rear differential lock and variable sport steering.
At the rear, BMW added a Gurney flap, a “Vertical Dynamics Platform,” controlled shock absorbers, and a structural brace the engineers call the Driving Dynamics Brace, on top of the xDrive hardware already doing the torque-vectoring work. Up front, upper and lower structural struts effectively sandwich the engine into the chassis for added torsional stiffness — the kind of reinforcement that showed up on the high-speed circuit, where the car held its line through long, off-camber corners at 150-190 km/h without any sense of flex.
Drift Moment: A Rear-Drive Mode Coming Later via OTA Update
The most talked-about feature won’t even ship at launch. Drift Moment, activated with a button on the Central Display, sends the engine’s drive fully to the rear wheels for what BMW frankly describes as maximizing “the joy of going sideways.” It arrives sometime in 2027 via Remote Software Upgrade — and critically, that update reaches every M350 already delivered to customers by that point, not just new production. On BMW’s wet-handling course, disabling stability control entirely showed a preview of the behavior: the AWD system already biases hard to the rear under power, with BMW citing a current front-to-rear torque split as extreme as 20-80, a long way from the roughly 40-60 split used as its typical cruising default.
Software Borrowed From BMW’s Electric Heart of Joy
BMW frames its combustion-engine driving software as an adaptation of the same “Heart of Joy” philosophy built for the fully electric i3, working with the same functional principle but slower actuators. Where an electric motor can shuffle torque between axles in milliseconds, a combustion engine takes roughly 100 milliseconds to spool torque up or down — slow enough for a driver to notice. BMW’s answer is to lean on faster mechanical actuators instead: the brakes, the electronically controlled xDrive clutch, and the rear differential lock, all coordinated by a central controller reading a six-axis motion sensor in real time.
What We Still Don’t Know
BMW hasn’t published final weight figures, and the 4.1-second 0-62 mph claim comes with an asterisk — engineers wouldn’t confirm on record whether that number is measured with a one-foot rollout, a method some BMW M press materials have quietly started using because it shaves a few tenths off the published figure. Full specs, pricing, and the car’s uncamouflaged design are still to come, with production of the ICE models slated to start in the second half of 2026.
Recommended Product
The new M350 won’t reach dealers until well into 2026, so if you’re driving an E9x-generation 3 Series today, this front splitter is a way to sharpen the front end you already own while the next generation finishes its lap count in France.
Between the standard adaptive M suspension, the retuned B58 six, and a rear-drive drift mode arriving via software update, BMW is positioning the M350 xDrive as the closest an M Performance 3 Series has ever come to feeling like a baby M3 — without actually being one.
Does an over-the-air “Drift Moment” unlock sound like a genuine driving feature to you, or more like a marketing checkbox? Tell us what you think in the comments.
