Bovensiepen's 435 hp Spider is a Z4 that BMW no longer builds
Buchloe is building 99 roadsters in a segment everyone else has quit
Bovensiepen reveals the Spider, its third car and the first it has priced anywhere near what an Alpina used to cost. It is a two-seat roadster with a turbocharged straight six, a fabric roof and a run capped at 99. Andreas Bovensiepen, who worked on the BMW Z8 in Munich in the late 1990s, has wanted to build one for a long time.
The 3.0-litre straight six makes 435 hp and 580 Nm
Bovensiepen has taken the twin-scroll turbocharged 3.0-litre straight six to 320 kW, or 435 hp, with 580 Nm behind it. The gains come from breathing rather than boost: the intake duct has been unrestricted and given an extra ram-air channel, the intake silencer enlarged, and the sports exhaust reworked for flow and back pressure. A ZF eight-speed automatic shifts in around a tenth of a second in Sport. Zero to 100 km/h takes 4.2 seconds, and at 1,585 kg the car carries 3.6 kg for every horsepower.
The donor car is a BMW Z4, and Graz stopped building it in May
Bovensiepen never names the car underneath, but the measurements do. The Spider is 1,864 mm wide and 1,304 mm tall, matching the G29 Z4 to the millimetre, and its 281-litre boot is the Z4's exact figure. The paint list settles the argument: Sanremo Green, Thundernight and Frozen Grey II are BMW colours, and the standard Vernasca leather is a BMW trim grade. Magna Steyr in Graz built the last Z4 in May 2026, and no successor is planned.
435 hp is also what Toyota's GR Supra Final Edition made
The same Graz line built the Toyota GR Supra on the same architecture and the same BMW straight six. The GR Supra A90 Final Edition, limited to 300 cars, was lifted from 340 hp to exactly 435 hp with a redesigned intake and a lower-back-pressure catalytic converter. Bovensiepen has reached the identical figure by the identical route, and found 10 Nm more torque doing it. Two companies, working separately, have written the same last word on the same engine.
€115,500 in Germany makes this the cheapest Bovensiepen yet
The Spider costs €115,500 ex-factory Buchloe including 19 percent German VAT, which is roughly €97,100 before tax and about €117,400 in a 21 percent market such as Belgium or the Netherlands, before any national registration charge. That is a third of the €370,000 Zagato that launched the brand at Lake Como in May 2025. Orders open immediately and the first cars are due at the end of the first quarter of 2027.
Frank Stephenson drew the body, and 40 of the 99 are black
Frank Stephenson developed the exterior components, as he did on the 800 hp 05 GT: a gloss-black splitter with twin tips, wheel arch vents, side skirts, a rear diffuser and an integrated spoiler that stretches the tail. Twenty-inch forged wheels carry Michelin Pilot Sport 4 S tyres, 255/35 front and 295/30 rear. The 99 cars are allocated by colour before a single order is taken: 40 Sapphire Black, 25 Sanremo Green, 20 Skyscraper Grey, 9 Thundernight and 5 Frozen Grey II.
AutoNext Take
The number that matters here is not 435 or 99. It is €115,500. Bovensiepen's first two cars were statements rather than businesses, a €370,000 coupe and an 800 hp estate, and this is the first one priced where Alpina actually traded, between a well-specified M car and a base 911. It is the real test of whether the family name still sells cars or only headlines.
That test has a date on it. Graz stopped building the Z4 in May, so 99 is a supply number as much as an exclusivity one, and no hundredth car is possible however many people call. If the run is spoken for before the first deliveries at the end of March 2027, Bovensiepen has a business. If it is not, a brand that builds on cars other firms have discontinued will run out of cars to build on.
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