When a beloved platform reaches the end of its production life, it sometimes finds its truest expression not in the factory that made it, but in the hands of those who have spent generations understanding it more deeply. Bovensiepen — heirs to the Alpina philosophy of elevation over aggression — has taken the departing BMW Z4 and distilled it into the Spider, a 320-kilowatt limited edition that quietly surpasses both its donor car and its Toyota twin. Only 99 will exist, each one a considered argument that refinement, not revolution, is the more enduring form of performance.
Bovensiepen Spider: BMW Z4 gets 320kW tune-up from Alpina's founding family
A final statement on a platform BMW has already moved past
Mark
So Bovensiepen is just the founding family of Alpina doing their own thing now that Alpina is fully owned by BMW?
Mimi
Essentially, yes. They've spun out and are building their own cars, but the DNA is the same—taking BMWs and making them feel more purposeful and refined.
Luke
But we should be clear: this is a Z4 that's already out of production. They're not reviving the car; they're extending its life for a very small, wealthy audience.
Mark
How much more powerful are we talking?
Mimi
The Spider makes 320 kilowatts and 580 newton-meters. The standard Z4 M40i was 250 kilowatts and 500 newton-meters. So a meaningful jump—70 kilowatts more.
Luke
Though the final GR Supra also hit 320 kilowatts, so it's not like the Spider is uniquely powerful. It's competitive, not revolutionary.
Mark
And only 99 will be made?
Mimi
That's right. At 115,000 euros each. It's a limited, bespoke product.
Mark
Who designed it?
Mimi
Frank Stephenson. He's done the X5, the original Mini, the McLaren P1, the Ferrari F430. He's a serious designer.
Luke
The design work is real—the splitter, the diffuser, the vents are all functional, not just visual theater. But we're still talking about a convertible that's already been discontinued by its maker.
Mark
So this is really for collectors or enthusiasts who wanted a Z4 but wanted it to be more?
Mimi
Exactly. It's the last word on a platform that BMW has already moved on from.
The Pulse
- The BMW Z4 has already ceased production, yet Bovensiepen has intervened at the eleventh hour to give the roadster a more powerful final chapter than BMW itself wrote.
- With 320kW and 580Nm on tap, the Spider doesn't just outrun the standard Z4 — it matches or beats even the Toyota GR Supra Final Edition, the last and most potent of that line.
- Designer Frank Stephenson, whose fingerprints are on the McLaren P1 and Ferrari F430, shaped the Spider's visual identity, lending the car a pedigree that goes well beyond badge engineering.
- Beneath the sharpened bodywork, retuned suspension, upgraded brakes, and a ram-air-fed straight-six signal that this is an engineering exercise as much as an aesthetic one.
- With just 99 units priced from €115,000 and a bespoke Saddlery interior program on offer, the Spider lands as a collector's artifact — scarce, purposeful, and already looking back at a platform the industry has moved on from.
When a beloved platform reaches the end of its production life, it sometimes finds its truest expression not in the factory that made it, but in the hands of those who have spent generations understanding it more deeply. Bovensiepen — heirs to the Alpina philosophy of elevation over aggression — has taken the departing BMW Z4 and distilled it into the Spider, a 320-kilowatt limited edition that quietly surpasses both its donor car and its Toyota twin. Only 99 will exist, each one a considered argument that refinement, not revolution, is the more enduring form of performance.
The BMW Z4 may have already built its last example, but the Bovensiepen family — whose name is inseparable from Alpina's storied history — has given the roadster an unexpected and potent afterlife. Their new Spider is a strictly limited performance variant that, in both power and philosophy, exceeds what BMW itself delivered.
Bovensiepen's approach mirrors what made Alpina distinctive: take an existing BMW platform and elevate it through careful engineering and restrained visual refinement. The Spider's exterior was shaped by Frank Stephenson — the designer behind the original BMW-era Mini, the McLaren P1, and the Ferrari F430 — who added a revised front splitter, vented wheel arches, assertive side skirts, and a full-width rear spoiler over a new diffuser. Beneath the skin, 20-inch forged alloys, four-piston brake calipers gripping 395mm front rotors, and a retuned suspension with higher low-speed compression damping complete the chassis transformation.
The headline achievement is under the hood. A ram air intake, enlarged intake silencer, and sports exhaust help the turbocharged 3.0-litre straight-six produce 320kW and 580Nm — outpowering the standard Z4 M40i, the GR Supra, and even the GR Supra Final Edition. A 0–100km/h time of 4.2 seconds is claimed in base form, with a governed top speed of 260km/h. An optional Performance Package lifts that ceiling to 295km/h and adds a V-brace for additional chassis rigidity.
Inside, Vernasca leather and Alcantara are standard, with Bovensiepen's Saddlery program allowing buyers to personalise further. The sole transmission is an eight-speed ZF automatic. Production is capped at 99 units, priced from €115,000 — making the Spider less a tuned Z4 and more a final, considered statement on a platform the industry has already left behind.
The BMW Z4 convertible may have already rolled off the assembly line for the last time, but the car has found an unexpected second life in the hands of the family that once built Alpina. Bovensiepen, the company founded by the namesake family now fully absorbed into BMW's corporate structure, has taken the aging roadster and transformed it into something with considerably more bite: the Bovensiepen Spider, a limited-production performance variant that outguns both the standard Z4 and its Toyota Supra twin.
Bovensiepen occupies an interesting space in the automotive landscape. The company carries forward the philosophy that made Alpina distinctive—taking existing BMW platforms and elevating them through careful engineering and restrained visual refinement rather than aggressive aftermarket theatrics. The Spider exemplifies this approach. Visually, the car wears a sharpened suit: a revised front splitter, vented wheel arches, more assertive side skirts, and a rear diffuser that sits beneath an extended spoiler running the full width of the convertible. These details were designed by Frank Stephenson, the industrial designer whose portfolio includes the first-generation BMW X5, the original BMW-era Mini, the McLaren P1, and the Ferrari F430. Stephenson also recently lent his hand to the Bovensiepen 05 GT, a reinterpreted BMW M5 that debuted in June.
The engineering changes run deeper than the bodywork. The Spider rides on newly designed 20-inch forged alloy wheels with 10 spokes—half the spoke count of Alpina's traditional design—and sits above upgraded braking hardware: four-piston calipers gripping 395-millimeter rotors at the front, with 345-millimeter discs at the rear. The suspension has been retuned with higher low-speed compression damping, while longer auxiliary springs support the rear axle. But the real transformation happens under the hood. A ram air intake, enlarged intake silencer, and new sports exhaust, combined with other internal modifications, coax 320 kilowatts and 580 newton-meters from the turbocharged 3.0-liter straight-six engine. For perspective: the standard Z4 M40i produces 250 kilowatts and 500 newton-meters, the Toyota GR Supra makes 285 kilowatts and 500 newton-meters, and even the final-edition GR Supra Final Edition—the last of that line—managed only 320 kilowatts and 570 newton-meters. The Spider matches or exceeds them all.
Performance figures reflect these gains. In base form, Bovensiepen claims a 0-to-100-kilometer-per-hour sprint in 4.2 seconds, matching the standard Z4, with a governed top speed of 260 kilometers per hour. Buyers who opt for the optional Performance Package unlock a 295-kilometer-per-hour ceiling and gain a V-brace that stiffens the chassis, along with a rear differential cover fitted with larger cooling fins. The transmission is fixed: an eight-speed ZF automatic is the sole option, its selector rising from the center console into an interior trimmed in Vernasca leather and Alcantara as standard. The heated steering wheel wraps in Lavalina leather, and customers can specify their own interior treatments through Bovensiepen's Saddlery program, allowing for personalization beyond the typical configurator.
Production will be strictly limited. Only 99 examples of the Spider will be built, priced from 115,000 euros—approximately 186,500 Australian dollars. That scarcity, combined with the engineering work and the designer pedigree, positions the Spider as something more than a tuned Z4: it is a final statement on a platform that BMW has already moved past, a reminder that there remains an appetite for convertible sports cars refined rather than revolutionized, and a continuation of the Bovensiepen family's long tradition of making BMWs feel like something more than they were designed to be.
Notable Quotes
Bovensiepen's vehicles are arguably a continuation of the brand formerly owned by its namesakes, providing performance upgrades while keeping its vehicles classy.— Reporting on Bovensiepen's philosophy
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