The new model is said to use a heavily modified 3.9-litre twin-turbocharged V8 engine, which has already been employed in the California T. The new turbocharged Ferrari 458 is expected to produce considerably more than that car's 412kW and 755Nm, with some reports suggesting a power output of about 500kW.
The images give little away about what is powering the 458 M, but it does appear to have more bulbous wheel arches that, at the rear at least, appear to have some additional sculpting under the white wrapping. It is almost certain the camouflage hides new air intakes that will feed cold air to the mid-mounted, twin-turbo powerplant.
Other rear-end changes include a new set of exhaust pipes, which move away from the eye-catching triple-tip setup of the 458 to a more conventional double pipe layout, with the tips expected to poke through the restyled rear bumper bar.
Stay tuned for more news on the 2015 Ferrari 458 M as it comes to hand.
Click the Photos tab for more images of the Ferrari 458 M undergoing testing.