From the early days at AMG to founding RENNtech and architecting the fearsome Hammer-era Mercedes monsters, Hartmut Feyhl’s journey is the kind of engine-roaring story that defines automotive lore. In the latest episode of duPont REGISTRY Talks, our Editor-in-Chief sits down with Feyhl – tuner-extraordinaire, technical savant, and the man behind that unmistakable AMG thunder – to peel back the curtain on his remarkable career.
Feyhl’s tale is one of migration, mastery, and motorsport passion. He arrived in the U.S. after a storied tenure at AMG in Germany, bringing with him the horsepower and precision that quickly made RENNtech the premier name in Mercedes-Benz tuning. You’ll hear how those iconic Hammer cars were born – a time when brute power met the highest levels of German engineering prowess, reshaping the world’s expectations of road-legal performance.
Expect insider secrets on how RENNtech fine-tunes everything from engine maps to suspension dynamics, along with wild stories from track testing, ultra-rare builds, and the obsessive pursuit of “performance without compromise” – a motto Feyhl instilled into every program from the brand’s 1989 birth onward.
Whether you're fascinated by high-octane engineering, boutique tuning legacies, or the relentless creative drive behind automotive icons like the Hammer Mercs, this episode is a must-listen. Tune in and discover how a single engineer’s vision helped define an era – and continues shaping performance car culture today.
