The new drop-top will be sold alongside its coupe sibling, revealed at the Frankfurt Motor Show, and only 240 cars will be produced.
The N400 roadster can also be specced with a sports package containing improved springs and dampers.
There are a number of technical improvements as well as enhancements to the standard roadster's range of colour and trim options.
The 4.3-litre engine has been boosted too, increasing power to 298 kW (400 hp) and peak torque to 420 Nm.
There?s also a revised side sill design, new bonnet and side strake meshes, clear rear lamp lenses and a bright finish grille.
The N400 badging denotes not only the power output of the car but also Aston's achievements at the N?rburgring where the V8 Vantage competed in a grueling 24 hour race.