Ahrens began racing in 1958 with a Cooper-Norton in Formula 3. He demonstrated strong ability in junior formulae, winning the German Formula Junior title in 1961 and again in 1963 — the year his father retired from active competition. The double title win established him as one of Germany's most promising young drivers.
Ahrens moved into Formula 2 following his Formula Junior success and became a regular participant in German motorsport's top events. He was present at the Hockenheimring in 1968 when Jim Clark was killed during a Formula 2 race — a tragedy that shook the racing world. The unique geography of the Nürburgring allowed Formula 2 cars to enter the German Grand Prix alongside Formula 1 machinery, owing to the length of the circuit making mixed-formula racing viable. Ahrens made use of this arrangement on multiple occasions, competing primarily with Brabham cars for the Caltex Racing team. At the 1968 German Grand Prix, run in wet conditions, he was invited to drive the Brabham-Repco Formula 1 car.
In 1968, Ahrens joined the Porsche factory sports car programme, a move that would define the most celebrated phase of his career. Partnering with Jo Siffert, he shared victory at the 1969 Austrian 1000 km event. He co-drove the pole-sitting Porsche 917 long-tail at the 1969 24 Hours of Le Mans, though the car failed to finish. He returned to Le Mans in 1970, again co-driving a Porsche 917 long tail, and again the car did not reach the finish.
His most significant result came in 1970, when he partnered Vic Elford to win the 1000 km Nürburgring in a Porsche 908 — a victory on one of motorsport's most demanding circuits.
Ahrens retired from racing after the 1970 season, taking particular pride in his record of never having crashed during a competitive race. The claim was tested during an April 1970 test session at Ehra-Lessien, where a high-speed shunt in a long-tail Porsche on a wet track caused the car to slide under the Armco barrier and break apart, leaving Ahrens strapped in the rear section. Despite the severity of the accident, it occurred in testing rather than racing, and Ahrens maintained his race-incident-free record through retirement.
Ahrens occupies a respected place in German motor racing history as a versatile driver who excelled in both single-seater and sports car categories. His wins with Porsche at the 1969 Austrian 1000 km and the 1970 Nürburgring 1000 km represent the peak of his competitive results, and his association with the dominant Porsche 917 programme places him among the drivers of that legendary era of endurance racing.
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