Bovensiepen Spider breathes new life into the retired BMW Z4 with 435 PS, limited to 99 cars

BMW wound up Z4 production in May, with the final example built at the Graz plant in Austria. Stepping into the gap is a new company set up by Andreas Bovensiepen after BMW formally acquired Alpina in early 2026. The Spider, capped at 99 units worldwide, is the firm's third project, following a Zagato-styled 4-Series and the 800-hp 05 GT based on the M5 Touring.

Styling input came from Frank Stephenson's design studio, though the changes stay close to the stock roadster: model-specific fender vents, a gloss-black front splitter, side skirts and a larger rear spoiler. Inside, Vernasca leather and Alcantara cover the seats, the wheel is wrapped in the Lavalina hide long associated with Alpina, and a leather-trimmed dashboard is optional.

The 3.0-litre turbocharged straight-six gains revised intake and exhaust work, lifting output from 340 PS in European trim to 435 PS with 580 Nm of torque. Power flows through a ZF eight-speed automatic — the only gearbox on offer, despite the late-run Z4 M40i having offered a six-speed manual — a choice Bovensiepen frames as consistent with Alpina's comfort-led philosophy. The sprint to 100 km/h takes 4.2 seconds, three-tenths quicker than the standard car.

Dampers are retuned and 20-inch forged alloys wear Michelin Pilot Sport 4S tires, while a Performance Package adds a temperature-controlling aluminum differential cover, an underbody V-brace and a raised 295 km/h top speed, with performance brakes also optional. German pricing starts at €115,500, before extras such as paint-to-sample finishes and bespoke cabin trim through the company's Saddlery personalization program.