A SPECIAL edition of the high performance Audi RS 4 Avant is being produced to mark the model's silver jubilee.

As the performance flagship, the model boasts enhanced driving dynamics, exclusive interior, and exterior details, and is available in Audi's iconic Imola Yellow finish.

At the same time, Audi is also launching the new RS 5 Sportback Performance Edition, which benefits from the same powertrain upgrades.

Depending on paint finish the special will cost from £115,880 to £119,180 and only 50 of the anniversary models will come to the UK

The 2.9-litre V6 biturbo in the new RS 4 Avant edition 25 years has an output of 470ps and a maximum torque of 600Nm. That is an increase of 20ps compared to the regular RS 4 Avant.

As a result, 0-62mph takes 3.7 seconds, 0.4 seconds faster than the standard version, while the top speed increases to 186mph.

Standard RS ceramic brakes provide the stopping power and the RS sports exhaust system plus - with tailpipes in matt black - generates an intense soundtrack.

The Audi RS 4 Avant edition 25 years comes standard with the RS sports suspension pro, a manually adjustable coilover suspension that ensures a perfect combination of dynamics and comfort. This gives the anniversary model a 10mm lower ride height than the regular RS 4 Avant.

Furthermore, the ride height can be lowered manually by an additional 10mm for an overall ride height that is 20mm lower. The vehicle also comes with the quattro sport differential,

Audi established the idea of the performance estate in the 1990s with the Audi Avant RS2 and Audi S6 plus.

However, the first RS model from quattro GmbH - now Audi Sport GmbH - was the 1999 B5-generation RS4 Avant.

Compared to the Audi S4, it broke onto the scene with a widened body and a 2.7-litre biturbo six-cylinder engine developed in collaboration with Cosworth, which at the time had an impressive 380ps output.

The sportiest version of the first RS 4 generation hit the market in 2001 with the RS4 Sport. Its features included even lower suspension, bucket seats, a sports exhaust, and a suede steering wheel.

The RS 4 Avant edition 25 years echoes the memorable design of this vehicle and is itself the sportiest version of the current series.

On the special model the trims on the side windows come in glossy black and for the first time, the edition features a black inlay in the rear lights.

The Audi rings and lettering also come in gloss black, and the Matrix LED headlights feature darkened bezels specific to the RS family. The roof rails have been removed to give the vehicle a flatter, sportier silhouette.

Standard equipment includes a 3D sound system, Audi's advanced key, a 360-degree camera and wireless phone charging.

As a highlight, "RS 4 edition 25 years" lettering is engraved in the windows between the door and rear pillars. The matt carbon appearance package was designed exclusively for the model and features the front spoiler lip, front air intake inserts, side skirts, rear diffuser insert and exterior mirror housings in matt carbon.

The interior has yellow decorative stitching and is reminiscent of the black/yellow leather Alcantara combination from the 2001 RS4 Sport. For the first time, the floor mats have an RS 4 logo, and the traditionally red Audi Sport rhombus and black RS lettering are now also yellow in the edition model.

Exclusive lettering on the centre console indicates each individual car's sequential number, from one to 250.

Those buying an RS 4 Avant edition 25 years can select a white background for the tachometer and speedometer via the MMI - a tribute to the 1994 Audi Avant RS2, where the analogue dials initially came in white.

Customers also receive an additional tyre set, the Pirelli sensorized P Zero Trofeo RS semi-slick tyres and Pirelli Track Adrenaline system. The tyres are specifically designed for the racetrack and come on 20-inch alloy wheels in matt black.

Meanwhile, the RS 5 is also receiving a power upgrade: The V6 biturbo in the new Audi RS 5 Sportback Performance Edition has the same output of 470ps and a maximum torque of 600Nm and similar performance to the special RS 4.

The Audi RS 5 Sportback Performance Edition also comes standard with the RS sports suspension pro with progressive steering and an improved Torsen differential.

Only 10 examples of this limited-edition model will come to the UK market with prices starting at around £110,000.