The new Audi RS6 Avant Performance – now the sole version of the super-estate sold in the UK – has made its local debut.

Fitted with a larger turbocharger, its 4.0-litre twin-turbocharged petrol V8 has been uprated by 30bhp and 37lb ft to deliver 621bhp and 627lb ft, reducing the 0-62mph sprint time by 0.2sec to 3.4sec.

The super-estate is joined by the new Audi RS7 Sportback Performance, which uses the same powerplant and gets identical performance figures.

Both cars continue with the same eight-speed dual-clutch automatic gearboxes and carbon-ceramic brakes.

New additions come in the form of 22in lightweight wheels – available in gold – that are wrapped in high-performance Continental Sport Contact 7 tyres. A self-locking centre differential also comes as standard. 

Audi has binned much of the insulation from both cars’ engine bays in a bid to reduce weight, which now stands at 2090kg in the RS6 and 2065kg in the RS7 – a reduction of 8kg a piece. The insulation removal brings with it a louder sound from the engine, Audi claims.

Prices now start from £109,570 for the RS6 Avant and £113,225 for the RS7 Sportback.

Standard equipment now boasts the Park Assist Pack (a head-up display and a 360deg camera) and will soon include the RS Dynamic Pack , which includes an upped 174mph top speed, all-wheel-drive steering and a Quattro Sport differential on the rear axle.

Other additions the new variants bring include the new Ascari Blue and Dew Silver matt paint colours and Marcato blue interior accents.

Elsewhere inside, much remains unchanged, with both models keeping Audi’s 12.3in Virtual Cockpit display, which now boast motorsport-derived shift indicators (for optimal gearshift times) as well as a new traffic-light system for the launch control.