AUDI is introducing special editions of its RS 4 Avant and RS 5 Coupe models which will appeal to devotees of the latest 450bhp sport stars.

The Carbon Edition specials, which will not be production limited, add motorsport-inspired carbon fibre reinforced polymer detailing, including a fully exposed CFRP roof in RS 5 versions.

The RS 4 is priced at £71,625 and the RS 5 at £75,400, with the RS 5 arriving in December, followed by their RS 4 counterparts in March.

As well a CFRP roof, which is reserved exclusively for the RS 5, both new editions incorporate a carbon matt aluminium styling pack adding a CFRP finish for the front spoiler (and the rear in RS 5), sill extensions, a diffuser insert and interior inlays along with CFRP door mirror housings.

A matt aluminium finish for the radiator grille with its integral matt titanium quattro logo, for the window surrounds and for the front horizontal under-grille bar complement the carbon detailing, as does privacy glass and 20-inch alloy wheels in anthracite matt black, which replace the standard 19-inch design.

Under the bonnet of both Carbon Edition models lies Audi'se new 2.9-litre biturbo TFSI engine with its 450bhp output and 600Nm torque peak - a substantial 170Nm more than its V8-powered predecessor.

It delivers 0-62mph in as little as 3.9 seconds (RS 4 Avant 4.1 seconds), and a 155mph top speed which can be increased to 174mph

In the Carbon models the new engine breathes through an upgraded RS sport exhaust system which amplifies its soundtrack and is controllable via the standard Audi drive select adaptive dynamics system.

For the most committed drivers, Audi Sport also offers optional RS sport suspension with dynamic ride control, ceramic brakes and dynamic steering with RS-specific tuning.

Highlights from the list of safety-focused features of all RS 4 and RS 5 variants include multi-collision brake assist and the Audi side assist blind spot warning system.

Owners can increase protection even further by choosing option bundles including the driver assistance pack, active lane assist, cross traffic assist rear and turn assist.