This one-off, record-holding boat has a Ferrari race engine and a $12 million price tag — see the 1952 Arno XI

1952 Ferrari Arno XI Racing Boat_OEM_11 — 1952 Ferrari Arno XI Racing Boat.
DuPont Registry

The 1952 Ferrari Arno XI is a record-holding race boat that uses the engine from a Ferrari Formula One race car.
It currently still holds the world record in the flying kilometer, according to its sale listing at DuPont Registry.
The Arno XI is for sale for $12 million.
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Here's a boat that you've probably never heard of before, or seen in even your most bizarre dreams: the 1952 Ferrari Arno XI. Yes, it's real. And yes, it's for sale.

Built to break the world speed record on water, it was proposed by Italian maritime racer Achille Castoldi, according to the listing on DuPont Registry. The boat uses a twin-supercharged, race-prepared engine out of a Ferrari Formula One race car.

The DuPont listing doesn't include the price of the Arno XI, but a representative for the seller told Business Insider they're asking $12 million.

Keep reading to see more of the Arno XI.

The 1952 Ferrari Arno XI is a racing boat built to break world speed records on the water. It's now up for sale.

1952 Ferrari Arno XI Racing Boat_OEM_4 — 1952 Ferrari Arno XI Racing Boat.
DuPont Registry

Achille Castoldi, an Italian maritime racer, proposed the idea to Enzo Ferrari himself. Ferrari said yes.

1952 Ferrari Arno XI Racing Boat_OEM_10 — 1952 Ferrari Arno XI Racing Boat.
DuPont Registry

Castoldi commissioned a hardwood, three-point hydroplane with a mahogany veneer covering it.

1952 Ferrari Arno XI Racing Boat_OEM_8 — 1952 Ferrari Arno XI Racing Boat.
DuPont Registry

The upper body was painted in Ferrari red. Enzo Ferrari sent the Scuderia Formula One team to help with the engine.

1952 Ferrari Arno XI Racing Boat_OEM_2 — 1952 Ferrari Arno XI Racing Boat.
DuPont Registry

Enzo Ferrari had his chief engineer, Stefano Meazza, put the 4.5-liter V12 engine from their Formula One race car into the boat.

1952 Ferrari Arno XI Racing Boat_OEM_3 — 1952 Ferrari Arno XI Racing Boat.
DuPont Registry

To make extra power, two superchargers were installed.

1952 Ferrari Arno XI Racing Boat_OEM_5 — 1952 Ferrari Arno XI Racing Boat.
DuPont Registry

After the race tune, the engine could make between 550 and 600 horsepower.

1952 Ferrari Arno XI Racing Boat_OEM_1 — 1952 Ferrari Arno XI Racing Boat.
DuPont Registry

The Arno XI set a world record in the flying kilometer at 150.49 mph.

1952 Ferrari Arno XI Racing Boat_OEM_6 — 1952 Ferrari Arno XI Racing Boat.
DuPont Registry

The record still stands today, its sale listing said.

1952 Ferrari Arno XI Racing Boat_OEM_7 — 1952 Ferrari Arno XI Racing Boat.
DuPont Registry

The listing mentions that because it is the only boat to ever have Scuderia Ferrari power, it's being completely restored by Ferrari's restoration arm, Ferrari Classiche.