Lotus has given the Emira more power while cutting weight and sharpening its aerodynamics. The company describes the new 420 Sport as the lightest and most powerful version of its mid-engined sports car yet.

It is now the quickest model in the lineup, using a Mercedes-AMG-sourced 2.0-litre turbocharged four-cylinder engine. Lotus lists output at 416bhp, with the eight-speed dual-clutch automatic sending power to the rear wheels.

That makes the 420 Sport more powerful than both the V6 Emira and the standard four-cylinder model sold in the US. It can hit 62mph in 3.9 seconds and reach a top speed of 186mph.

Lotus has also reshaped several parts of the body to improve cooling and keep the car more stable at speed. Changes include a longer front splitter, revised bumper openings, wider side sills and larger air intakes, along with a new ducktail spoiler at the rear.

Together, the aerodynamic updates generate an additional 25kg of downforce without increasing the Emira’s overall drag. Removable panels around the license plate and brake ducts can also improve airflow to the radiators and front brakes during track driving.

Buyers looking to reduce more weight can add the optional Lightweight Handling Pack. It includes Michelin Pilot Sport Cup 2 tyres, a lithium-ion battery, titanium exhaust and adjustable Multimatic dampers. The pack cuts around 25kg compared with the Emira Turbo.

Despite those changes, the 420 Sport keeps the hydraulic steering that has helped define the Emira’s driving experience. Those who have driven it have found that the added power and revised chassis made it feel more urgent on track without taking away the steering feedback associated with Lotus.

Inside, the Emira combines leather and faux suede with a 10.3-inch touchscreen and larger carbon-fibre gearshift paddles. A 10-speaker KEF audio system is also available for buyers who want something more substantial than the standard stereo.

US pricing starts at $125,400, putting the Emira 420 Sport close to Porsche 911 territory. It may be expensive for a compact four-cylinder sports car, but its low weight and hydraulic steering give it a character that is becoming increasingly difficult to find.