If there’s one motorcycle proving Buell Motorcycle Company engineers have completely lost their minds—in the best possible way—it’s the turbocharged “Leviathan.”

Developed by Buell engineer Jacob Stark for land-speed racing at Bonneville Speed Week, the Leviathan is a fully turbocharged custom machine reportedly producing an absurd 401 rear-wheel horsepower.

Yes, 401 horsepower.

At the rear wheel.

Built around aggressive hammerhead-inspired aerodynamic bodywork, the motorcycle was specifically engineered for top-speed stability and outright brutality on the salt flats.

The project highlights just how much untapped performance potential Buell engineers believe exists within their modern platforms. While most manufacturers would be content simply launching a new production motorcycle, Buell simultaneously decided to build a turbocharged missile capable of chasing land-speed records.

According to Bill Melvin, Jacob Stark plans to campaign the Leviathan at Bonneville later this year in pursuit of official speed records.

The build also represents something larger philosophically for Buell.

Historically, the company earned a reputation for unconventional engineering and fearless experimentation under founder Erik Buell. The Leviathan feels like a continuation of that rebellious mentality—an engineering exercise driven less by market research and more by pure obsession.

And frankly, that’s refreshing.

In an era where many motorcycles feel increasingly sanitized by regulations and corporate focus groups, the Leviathan exists simply because Buell engineers wanted to build something insane.

That alone makes it one of the coolest American motorcycle projects happening right now.