Under its bonnet is the M139 2.0 litre turbocharged inline-four cylinder petrol engine that continues to output 421 PS at 6,750 rpm and 500 Nm of torque from 5,000 rpm to 5,250 rpm, sent to all four wheels via the AMG Speedshift 8G dual-clutch eight-speed automatic transmission. This setup propels the CLA45S from 0-100 km/h in 4.1 seconds and to a limited top speed of 270 km/h, according to the manufacturer.
Rolling stock for the CLA45S as standard is a set of 19-inch AMG five-twin-spoke, aero-optimised light-alloy wheels with a high-gloss rim flange, or the 19-inch AMG cross-spoke forged alloy wheels as an option . The included AMG Night Package brings a high-gloss black finish for the front splitter, exterior mirror housing, as well as the belt and window line trim strip, along with black chrome-plated exhaust outlets.
The Street Style Edition brings the Manufaktur Mountain Grey magno paint finish, side decals with the AMG logo and AMG chequered-flag pattern, and fluorescent orange highlights. The 19-inch cross-spoke forged alloys are matte black with high-gloss machined flange, and are standard fit on the Street Style Edition. Also included are the aforementioned AMG Night Package I and II, AMG Aerodynamics package and the AMG fuel filler cap.
Interior trim elements in the Street Style Edition feature the same patterns as on its exterior decals, while the instrument panel gets orange contrast stitching, door sill trim with AMG lettering, a black interchangeable cover and interior ambient lighting in red, specific to the Street Style Edition.