BMW Z4 Returns as a 429-HP Roadster BMW Never MadeAutoblogRex SanchezSat, September 12, 2026 at 5:51 PM UTCAdd us on GoogleAutoblog and Yahoo may earn commission from links in this article.A Z4 With a Different Last NameBMW ending production of the Z4 is such a tough farewell, given the model's roadster characteristics that set it apart from the brand's full-fledged performance cars like the M2 and M4. No successor has been confirmed yet, though a new limited-series Z4-based model just emerged thanks to Bovensiepen.Sure, this may not be a factory Z4, but Bovensiepen has deep ties to BMW. The family behind Bovensiepen founded Alpina before selling the brand rights to the Bavarian automaker, but the family still wanted to build cars and has now created this Z4 spin-off called the Spider. The Spider is the third BMW-based model in Bovensiepen's lineup, following the M4-based Zagato and M5 Touring-based 05 GT. It boasts upgrades inside and out, essentially creating a more aggressive road-legal version of the roadster than BMW ever put into production.BovensiepenA Roadster With More To GiveStarting with the powertrain, the Bovensiepen Spider retains the Z4's B58 turbo straight-six engine, but now makes 320 kW (429 horsepower) and 580 Nm of torque (428 lb-ft). That's nearly 50 hp more than the U.S.-spec Z4 M40i. The German manufacturer claims a 0 to 100 km/h (0 to 62 mph) sprint time of 4.2 seconds and a top speed of 260 km/h (162 mph). The increased output is made possible through revisions to the intake and exhaust systems that allow the engine to breathe more freely. A Performance Package is also offered, which raises the top speed to 295 km/h (183 mph) and adds a rear differential cover with larger cooling fins and underbody reinforcement with a V-brace.AdvertisementAdvertisementIn addition to the powertrain upgrades, the Spider is equipped with retuned dampers, longer rear auxiliary springs, 20-inch wheels wrapped in Michelin Pilot Sport 4 S tires, and optional upgraded brakes with four-piston fixed calipers on the front axle.The exterior was designed in collaboration with Frank Stephenson, the car designer known for his work at Ferrari and McLaren, including the P1. The Spider features some aero tweaks, like the extended rear spoiler, that give the roadster a sportier finish. Inside, Vernasca leather upholstery and Alcantara seat inserts come standard, while more extensive leather trim is also available.BovensiepenOne for the FewBovensiepen is limiting production to just 99 examples, including 40 in Sapphire Black, 25 in Sanremo Green, 20 in Skyscraper Grey, nine in Thundernight, and five in Frozen Grey II. Customers can still request a different paint color.Prices start at €115,500, approximately $134,000 at current exchange rates. On paper, that's about twice the starting price of the U.S.-spec Z4 M40i. Reports have raised the possibility of an electric successor, but nothing has been confirmed, so perhaps this Bovensiepen Spider may be among the last compelling takes on the combustion-powered BMW roadster.BovensiepenView the 4 images of this gallery on the original articleAdvertisementAdvertisementThis story was originally published by Autoblog on Sep 12, 2026, where it first appeared in the News section. Add Autoblog as a Preferred Source by clicking here.