The Z4 is dead, yet this 435-hp Spider refuses to disappear
The Z4 story was supposed to end in 2026. Instead, Bovensiepen turned its hardware into a 435-hp Spider limited to just 99 cars.
The BMW Z4 has left the stage, but writing its final chapter was apparently premature. BMW had already announced that roadster production would end in March 2026, with the Final Edition serving as the model's farewell. Then the Bovensiepen family, which spent decades behind Alpina, gave the hardware a second life. The new Spider is a separate low-volume model with 435 hp, and only 99 will be built.
The biggest surprise is under the hood. The European BMW Z4 M40i made 340 hp and 500 Nm, while the Bovensiepen Spider produces 435 hp and 580 Nm. That is an extra 95 hp, or almost 28%, while torque rises by 80 Nm, or 16%. And this is more than a software tweak: the engineers freed up the intake path, added a dedicated Ram Air duct, enlarged and optimized the intake silencer, and reworked the sports exhaust system.
Bovensiepen did not stop at extra power. The roadster gets retuned dampers and longer auxiliary springs on the rear axle. The Performance Package goes further with a V-shaped underbody brace and an aluminum rear differential cover with larger cooling fins. Top speed is 260 km/h as standard, while the package raises the limit all the way to 295 km/h.
The price makes it obvious just how far the Spider has moved beyond an ordinary Z4. In Germany, it starts at €115,500 — about $134.6 thousand. Cheap? Definitely not. But this roadster is no longer pretending to be a normal BMW either.
The most intriguing number here is not even 435 hp, but 99 cars. That is the entire Spider production run Bovensiepen plans to build, with first deliveries expected by the end of the first quarter of 2027. The real question now is whether all 99 will find owners before the first cars even reach customers.