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Line up three very different machines and one common heartbeat emerges. The BMW M440i Convertible, our featured car, shares its 3.0-litre B58 straight-six with the Morgan Supersport and Ineos Grenadier, yet each deploys that silk-smooth torque in its own way. Roof folded, the M440i lets the soundtrack breathe, its mild-hybrid boost filling out the low-to-mid range while xDrive traction fires it cleanly out of bends. It’s the consummate all-rounder: precise steering, supple damping and a gearbox that always seems to be in the right ratio.
The Morgan takes the purist route. Lighter and rear-driven, it feels alert and eager, with the B58’s shove arriving early and building to a keen top-end rush. The latest CX-based underpinnings trim away old quirks, so it now rides out lumps and cambers with real composure. Keep it in the hotter settings and the ZF eight-speed snaps through shifts briskly, letting that straight-six bellow carry down the road while the chassis sits neatly on its contact patches.
At the other end of the spectrum, the Ineos Grenadier favours grit over g-force. Detuned for graft, the B58 pours out chunky mid-range pull that suits its ladder-frame stance and serious hardware. Steering is slow but honest, the whole vehicle preferring measured inputs to hustling. Settle into a steady rhythm and the engine’s familiar thrum becomes an amiable companion, turning long stretches of A-road into a relaxed, unhurried cruise.
Back in the BMW, the breadth of ability is striking. Roof up or down, the M440i keeps noise in check, its chassis remaining composed even when the pace climbs. The balance between accuracy and playfulness is classic Munich: weight builds naturally at the rim, body control stays tidy, and the drivetrain knits everything together with seamless, turbocharged torque. It shrugs off poor surfaces and wet weather alike, feeling cohesive in a way that flatters everyday driving as much as it rewards a Sunday blast.
Three distinct shapes, one standout engine. The B58 stitches the trio together, yet the BMW M440i shows the most complete interpretation of its character: refined when you need it, eager when you ask, and always mechanically satisfying. If you want the B58 at its most rounded and road-ready, the drop-top M440i is the pick of this very unusual bunch.
