The Evolution of the ALPINA X5: From Secret Prototype to BMW X5 4.6iS

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Before the XB7, ALPINA built a secret V8 X5. It sold BMW on the idea and gave rise to 10,467 X5 4.6iS SUVs.

For many years, ALPINA has been synonymous with discreet, effortlessly fast luxury. Since its establishment in 1965, the Buchloe-based manufacturer has garnered a dedicated following for its understated body kits, iconic multi-spoke wheels, and a substantial surge of torque on the autobahn. However, when enthusiasts think of ALPINA, they typically envision sleek sedans and coupes like the B7 S Turbo, B10 BiTurbo, and B12 5.7, rather than high-riding family vehicles.

Upon ALPINA’s official entry into the U.S. market in 2002, it wasn’t with a sedan but with the legendary ALPINA V8 Roadster (E52 Z8). Powered by a modified 4.8-liter M62 V8 engine mated to a five-speed Switch-Tronic automatic transmission, ALPINA only produced 555 units globally, with 450 of them allocated to the American market.

It took another 11 years for Buchloe to make its mark in the SUV/SAV segment, introducing the diesel-powered XD3 BiTurbo in 2013. However, American consumers had to wait until 2021 to experience a large, high-performance ALPINA SUV with the debut of the 612-horsepower XB7. Interestingly, BMW manufactures its X models in Spartanburg, South Carolina, despite ALPINA’s SAVs having American origins from the beginning, leaving U.S. buyers waiting eight years for their turn to enjoy the ride.

History almost took a different turn, though. Two decades prior to the XB7’s dominance on the fast lane, ALPINA came close to producing a performance SUV that would have been immensely popular in the United States: the ALPINA X5 (E53). The following narrative was recounted by former ALPINA CEO Andreas Bovensiepen.

The Secret Prototype That Altered the Course

Upon the introduction of the original E53 X5, Wolfgang Reitzle, Head of Development at BMW, and Burkhard Göschel, a BMW board member, recognized the robust chassis but felt that the standard 4.4-liter V8 lacked the desired performance. Reitzle reached out to his close associate, ALPINA founder Burkard Bovensiepen, to explore the possibility of enhancing BMW’s new SUV.

ALPINA swiftly responded by transplanting the engine from the E39 B10 V8 into an E53 chassis, creating a clandestine, fully operational prototype developed predominantly in-house. Initially, Reitzle envisioned ALPINA handling production, targeting approximately 3,500 units annually. However, due to the limitations of Buchloe’s small facility, such volume was unattainable without significant operational disruptions. Nevertheless, ALPINA continued to refine the prototype to showcase its full potential to BMW.

When BMW executives finally test-drove the prototype, they were thoroughly impressed.

Birth of the BMW X5 4.6iS

The performance was so exceptional that BMW proposed taking over the project and launching it as an official factory model. Mr. Bovensiepen readily agreed to relinquish control, particularly as he was hesitant about affixing an ALPINA emblem to an SUV. Under the arrangement, ALPINA supplied the robust engine components, including the crankcase from its F3/F4 engine configurations. BMW then assembled the engines directly on the production line in South Carolina, labeling the powerplant M62TUB46.

The covert test prototype became the foundation for a burgeoning icon: the BMW X5 4.6iS. Rather than remaining a rare bespoke endeavor, the 4.6iS was manufactured in Spartanburg, yielding a total of 10,467 units. It transformed the original X5 into an instant classic and demonstrated that a hefty SUV could exhibit driving dynamics akin to a true driver’s car, all thanks to a discreet collaboration with Buchloe.

Exclusive images unveil an ALPINA-tailored interior featuring a blend of purple and blue leather on the seating, center console, and door panels. Additionally, an ALPINA steering wheel was installed. Interestingly, BMW Classic repurposed the covert prototype as a utility vehicle for several years, utilizing it for daily parts transportation. Regrettably, there was no fairy-tale conclusion as it was eventually scrapped.

[Images courtesy of Todd Goldberg / instagram.com/OGX5M]