Developed to replace the 75 and based on the parent company Fiat Group's Tipo Tre platform, the 155 was somewhat larger in dimension than the 75 and had evolved styling from that of its predecessor.

There were several Sport Packs available, including a race inspired body kit (spoiler and side skirts) and black or graphite coloured 16-inch Speedline wheels.

The 155 was never produced in the Sportwagon bodystyle (Alfa Romeo's term for an estate or station wagon), but Sbarro made a proposal for such a model in 1994 which was not put into production.

The Q4 also incorporated three differential gears (normal at the front, epicyclic at the centre (including a Ferguson viscous coupling) and Torsen self-locking at the rear).

The pack was included in the boot as bolt on aero kit, consisting of an adjustable rear spoiler and extendable front air splitter.

[13] These changes caused controversy during the 1994 BTCC as it was seen as an unfair advantage by the other teams and after missing 1 race, Alfa Romeo were forced to run with aero in its lowest downforce form to finish the championship.

This anomaly came about because the 1.8 L engine block, with its narrower bore, allowed Alfa Romeo to use a longer stroke on the racing car and stay within the 2.0 L capacity limit.

In 1995, the 155 was given an extensive revamp, resulting in wider front and rear tracks with subtle enlargement to the wheel arches to accommodate the changes underneath.

They also sported round or oblong indicator side-repeaters and had their model badges moved below the rear lights rather than having them above.In 1992, Alfa Romeo on the wake of the wins obtained by the 155 GTA in the Italian CIVT championship, decided to start the production of a "Stradale" version to be manufactured at the Abarth workshop.

The interior was stripped of some creature comforts and the car was fitted with a race inspired body kit with a large rear spoiler.

The 156 was to continue the high standard set by the 155, winning the European Touring Car Championship multiple times.

A naturally-aspirated high-revving 2.5 L 60° V6 engine was coupled to a four wheel drive system, rated at 426 PS (313 kW; 420 hp) at 11,500 rpm.

The victories were obtained by seven different drivers: 17 (+1) Nicola Larini, 13 (+1) Alessandro Nannini, 2 Stefano Modena, 2 (+1) Christian Danner, 2 Michael Bartels, 1 Kris Nissen, and 1 Gabriele Tarquini.