Powering the Adam S is a turbocharged version of the existing 1.4-litre four-cylinder engine, which develops 148bhp and 162lb ft. Vauxhall says the performance Adam can reach 62mph in 8.5sec, with a top speed of 124mph. Power is sent to the front wheels via a six-speed manual transmission.
Official fuel economy is rated at 47.8mpg combined, with CO2 emissions of 139g/km.
Styling changes over the standard Adam include a body kit, tuned chassis, uprated springs and dampers and VXR brakes borrowed from the previous-generation Corsa VXR. The model sits on 18in alloy wheels.
Inside, the Adam S features special floor mats, pedals and door trim. Vauxhall's Intellilink infotainment system features on the options list, as do Recaro seats.
Although weight-saving measures on the Adam S include a cast iron engine block with hollow frame structure, hollow-cast camshafts and a plastic intake manifold, the car's kerb weight is set at 1178kg - 58kg heavier than the Adam 1.4 Slam.
The Adam S was first seen in pre-production form at the Geneva motor show last March, when it was badged as Adam S before its short-lived change to Grand Slam for UK markets.
Vauxhall UK boss Tim Tozer says the Adam S "has been designed for people who want to enjoy a sporty driving experience in a car with a unique and individual look".
The Adam S also rules out any VXR-badged version of the Adam being made.