The Porsche 911 is perhaps the best example of a specific make and model that evolves over time. It's been in continuous production since 1964 and still retains its rear-engine, flat-six setup. It's truly an icon. But icons still require updates and the latest generation 992 911 Turbo is getting one.

We caught our first look at the refreshed 911 Turbo last month and today our spy photographers captured a second prototype undertaking harsh winter weather testing. Bear in mind this is still an early test mule, meaning a majority of its styling updates are still hidden but the car's overall design won't dramatically change. We can, however, see some differences compared to the model currently on sale.

Notice the front bumper's adjustable vents from the active aero are now vertical as opposed to the existing horizontal design. The center section up front where the cameras and radar are located has also been somewhat tweaked. At the rear, camouflage covers the light bar while the taillights seem to have a new split look. The 992.1 Turbo's light bar is a single strip.

This latest batch of images doesn't include any interior shots, but we previously discovered there will be some cabin updates. Expect there to be fully digital dials similar to those found in the Taycan. Powertrain-wise, don't expect any drastic changes.

The same 3.8-liter twin-turbo flat-six will remain, producing at least 572 horsepower and 553 lb-ft of torque in the "base" Turbo. The Turbo S's 640 hp and 590 lb-ft of twist may increase, too. Typically, Porsche engineers find ways to boost output for midlife refreshes.

Regardless of the final output, power will continue to be sent to all four wheels through an eight-speed dual-clutch PDK gearbox. Acceleration will remain at supercar levels with at least a 0-60 mph time of 2.6 seconds for the Turbo S. The facelifted 911 lineup is due to arrive for model year 2023 with the Carrera likely set to debut first. The rest, including the Turbo, won't be too far behind.