Bovensiepen Spider: Limited BMW Z4 Roadster with 429 PS
The new Bovensiepen Spider uses the discontinued BMW Z4 as its basis, brings 429 PS, a 183 mph top speed and a small series of just 99 examples.
A new roadster on a discontinued basis
The BMW Z4 only recently went out of production, but the idea of the open two-seater from Munich has apparently not disappeared completely yet. With the Bovensiepen Spider, a heavily refined roadster is being created on the basis of the last Z4, aimed at customers who still value classic sports car proportions, rear-wheel-drive flair and a fabric roof more highly than SUV format or pure efficiency figures.
Bovensiepen is planning just 99 examples of the Spider. That makes the model less a regular production car than a small series for collectors and enthusiasts. In the United Kingdom, the price is being placed near 100,000 pounds. Concrete details on availability, delivery timing and possible allocations for individual markets are not yet fully known.
429 PS and up to 183 mph
Technically, the closeness to the BMW Z4 remains clearly recognizable, but Bovensiepen positions the Spider above the former series-production model. The figure quoted is 429 bhp, or around 435 PS by metric calculation. Top speed is 183 mph, equivalent to about 295 km/h. That moves the car into a range that is significantly above what many classic roadster buyers in this vehicle class have previously been used to.
The performance figures are only part of the story. The Z4 was most recently one of the few remaining compact premium roadsters with a longitudinally mounted engine, rear-wheel drive and a conventional claim to driving enjoyment. The fact that a specialist marque is using this very car as its foundation shows the standing the platform still has among driving-dynamics fans – even if BMW itself has so far not announced a direct successor.
Design with more independence
The Bovensiepen Spider is not simply a Z4 with a more powerful engine and a different emblem. The body receives several visible changes intended to make the car look sportier and more exclusive. These include a redesigned front section with a two-stage splitter, a pronounced ducktail spoiler at the rear and a modified diffuser. 20-inch forged wheels are also part of the roadster's appearance.
Frank Stephenson, a designer with experience in high-performance and luxury vehicles, was involved in the design. The aim of the project is a sportier, but not overloaded, look. That is crucial for a conversion based on the Z4: the original roadster had a relatively clean, long bonnet, a short rear and a low beltline. An overly aggressive conversion could easily have damaged these proportions. Bovensiepen therefore relies on distinctive elements that are nevertheless integrated into the basic shape.
Interior: luxury instead of pure racetrack optics
The Spider is intended not only to be faster, but also to feel more premium. The interior is described as being elaborately trimmed in leather and should therefore stand well apart from the standard Z4. Exactly this mix is typical of vehicles from the Bovensiepen family environment: more power, but not necessarily an uncompromising track-day approach. Instead, the focus is on the idea of a fast, cultivated touring car in roadster format.
For buyers, that means: the Spider is neither a replacement for an inexpensive convertible nor a purist lightweight sports car in the style of a Lotus. It targets customers looking for a rare open sports car with familiar BMW technology, an upscale finish and a handcrafted feel. The price close to the six-figure pound mark underlines this ambition.
Bovensiepen is building its own model world
The Spider is only the young brand's third model. Previously, a heavily modified coupé based on the BMW M4 and a high-performance estate based on the BMW M5 Touring had already been presented. This sequence shows a clear strategy: Bovensiepen selects capable BMW platforms and develops exclusive derivatives from them with their own design and a higher performance claim.
The Bovensiepen name is closely linked with Alpina, the marque that for decades stood for particularly fast, comfort-oriented interpretations of BMWs. The new Spider is therefore also interesting for the industry. It shows that, after Alpina's closer integration into the BMW Group, there is still room for independent, very small premium projects around BMW technology. Such cars do not serve large volumes, but they can strongly influence brand image, collector interest and enthusiast loyalty.
Why the Spider is relevant for buyers and fans
The market for classic roadsters has become significantly smaller. Many manufacturers prefer to invest in electric SUVs, crossovers or especially profitable luxury models. Open two-seaters with combustion engines, by contrast, are expensive to develop, difficult to homologate globally and often sell only in manageable numbers. The discontinued BMW Z4 is a good example of this development: popular with a loyal target group, but no longer automatically part of model planning.
That is exactly why the Bovensiepen Spider is more than an exclusive tuning variant. It preserves a type of vehicle that is becoming rarer in the new-car market: compact, open, powerful and emotional. Anyone wanting to buy such a car new has less and less choice. At the same time, the limited run of 99 units is likely to ensure that the Spider ends up more in collectors' garages than in large numbers on the streets.
For owners of a regular BMW Z4, the Spider can also strengthen the perception of the base model. When a specialist marque chooses the platform for a high-priced small-series car, that confirms the technical and emotional quality of the original vehicle. For used-car buyers, this could additionally support interest in the last Z4, especially in powerful variants with good equipment.
A farewell salute with collector potential
The Bovensiepen Spider arrives at a time when the classic combustion-engine roadster increasingly feels like a discontinued model. Its combination of 429 PS, a top speed of nearly 295 km/h, revised design and an extremely limited production run makes it a special offering for a small customer group. It will not reverse the withdrawal of such cars from the mass market. But it does show that there is still demand for handcrafted, refined open sports cars – even when volume manufacturers have long since set other priorities.
