679-horsepower McLaren MSO HS leaked

New photos of an upcoming limited edition McLaren have leaked.

The car, identified as either the MSO HS or the 688 HS, is one of a limited edition of 25 bespoke cars based on the Super Series, which includes the 650S and 675LT. HS stands for High Sport.

We first got a glimpse of the car back in May. Now, we have detailed shots courtesy of a leak on Czech website Autoforum.cz.

The car has 688 metric horsepower, which translates to 679 American horses. The additional 13 horsepower over the 675LT comes from blueprinting the 3.8-liter twin-turbocharged V-8 engine and porting and polishing the heads.

Handling the development was the McLaren Special Operations (MSO) team, which is a skunk works that can build bespoke cars. It was requested by a customer and MSO chose to make 25 available to offset the cost of development.

Some of the cars will make it to the United States, but the run of 25 has already been sold out. Despite this car’s red paint, each of the 25 units will feature its own exterior color and interior colors and materials. With so much personalization available, McLaren isn’t giving a price, but you can bet it will be considerably more than the 675LT’s $353,600 base price.

In addition to the engine upgrades, the car features a unique exterior aero kit. Together, these changes make the car the ultimate expression of the Super Series cars.

According to McLaren, the cars are already being built, and this red one is the first. The others will follow as MSO completes them. We expect to get more information from McLaren when the next car is ready.

A debut during this week’s Monterey Car Week is a strong possibility. MSO has already confirmed a 570GT-based concept for the event.

For more from Monterey, head to our dedicated hub.

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