| Mirafiori Special 1300 |- style="line-height:1.2em;" | Familiare 1600 |- style="line-height:1.2em;" | Familiare Special 1600 |- | Abarth Rally ||n/a | DOHC 16-valve I4 || || single twin-chokeWeber 34 ADF || |- |US version |131A1.040 |SOHC I4 | |n/a | |} Fiat 131 Abarth Rally In 1976, 400 examples of the Fiat 131 Abarth Rally were built for homologation purposes. These cars were built in a cooperation between Fiat, Bertone and Abarth. Bertone took part-completed two door standard bodyshells from the production line in Mirafiori, fitted plastic mudguards front and rear, a plastic bonnet and bootlid and modified the metal structure to accept the rear independent suspension. The cars were fully painted and trimmed and then delivered back to the Fiat special Rivalta plant where they received the Abarth mechanicals. The street version of the car used a DOHC 4 valves per cylinder derivative of the standard twin cam inline-four engine, equipped with a double downdraught 34 ADF Weber carburetors producing at 6400 rpm and of torque at 3600 rpm. The street cars used the standard gearbox with no synchromesh (Rally type regulations required the use of the same type of synchromesh on the competition cars as on the street versions) and the hopelessly underdimensioned brake system of the small Fiat 127. Competition cars used dry sump lubrication and eventually Kugelfischer mechanical fuel injection. In race specifications, the engine produced up to in 1980, being driven to World Championship status by Walter Röhrl. Series 2 The 131 got a minor facelift in 1978. New DOHC, or "Twin Cam" (TC) engines arrived, and these models were badged as Supermirafiori. The biggest changes exterior-wise for the Series 2 were larger rectangular shaped front lights (quad round headlights in the US), new bumpers (for the Supermirafiori), new bigger rear lights, while a new interior (CL, Supermirafiori) included the dashboard and a chunky, single-spoke steering wheel. Also in 1978, the 2-door sporting version Racing (Mirafiori Sport in the UK) with twin cam engine, was launched. This car had four round headlights (the inner headlights being smaller than the outer ones, unlike any other Mirafiori model produced), different grille, spoilers and extended wheel arches, and a short-throw 5 speed gearbox. The Racing had top speed of . Diesel engined versions also had four round headlights (equally sized), and a noticeable (and characteristic) bump in the hood to accommodate the taller engine. The Familiare (estate) was