Under the bonnet the company's 4.7-litre V8 has been retuned to deliver 328kW of power, which is 8kW more than the V8 Vantage GT. Torque output is unchanged at 490Nm.
Drive goes to the rear wheels via a limited-slip differential, and either a six-speed manual or a seven-speed Sportshift II automatic transmission.
To go along with the extra power, weight has been reduced by around 100 kilograms thanks to carbonfibre front seats, a lithium-ion battery, and carbonfibre door panels.
Visually, it will be hard to mistake the GT8 for lesser Vantages. Inspired by the V8 Vantage GTE race car, the GT8 features carbonfibre exterior body work with unmistakably pumped up fenders, including cutaways on the front fender.
Other exterior items crafted from carbonfibre include the front splitter, side sills, rear diffuser, and both the front and rear bumpers. An optional aero package (pictured here) adds corner elements to the front splitter and a large rear wing.
Items on the options list include polycarbonate rear windows, a carbonfibre roof and tailgate, titanium exhaust, and a three 'hero' paint packages (grey and blue; white; or green and lime).
With all the lightweight options fitted, the GT8 tips the scales at 1510 kilograms. Aston Martin expects that the GT8 will be able to complete the 0-60mph (0-97km/h) dash in 4.4 seconds and have a top speed of 306km/h. The V8 Vantage GT requires 4.6 seconds to hit 60mph.
The GT8 rides on 19-inch forged alloy wheels or optional centre-locking magnesium rims. All wheel choices are paired with Michelin Pilot Sport Cup 2 rubber. Stopping power comes courtesy of a ventilated and grooved Brembo braking package with 380mm discs and six-piston callipers up front, and 330mm discs and four-piston callipers at the rear.
Despite the car's focus on performance, the GT8 comes standard with air conditioning, a 160W audio system, and the company' AMi III infotainment system.
Production of the GT8 will be limited to just 150 units, and will be sold in all major markets except North America.