1. Lancia Delta HF Integrale
In 1988, Lancia achieved 10 wins out of 11 rallies and the world title, well before the end of the season with the 8-valve Delta HF Integrale. No rivals were able to keep up with its performance, reliability and durability throughout the season.
2. Citroen Xsara
The Xsara World Rally Car was based on the road-going Citroen Xsara hatchback, but ultimately the 310bhp, 2.0-litre engine is unique to the WRC car. The Xsara was one of the most successful cars ever to compete in the World Rally Championship, as it took Frenchman Sebastien Loeb to 28 rally wins and three consecutive Driver's Championship titles from 2004 to 2006.
3.Ford Escort RS1800 MK2
the Escort MK2 had a successful rally career. The Escort RS1800 was essentially a special car created for rallying. The works rally cars were very special machines as the body shells were heavily strengthened, they were fitted with wide wheel arch extensions and the highly-modified engine produced up to 270 bhp.
4. Audi Quattro
Audi burst on to the rallying scene in 1981 when it introduced the Quattro. Largely based on the road-going Quattro models, the engine of the original competition version produced approximately 300bhp. Over the next three years, Audi went on to introduce the A1 and A2 evolutions of the Quattro in response to the new Group B regulations, with the power increasing to around 350bhp. Key Quattro drivers included Hannu Mikkola, Michele Mouton (who became the first woman ever to win a world championship rally) and Stig Blomqvist.
5. Subaru Impreza 555
The Impreza was the car that announced Subaru as a serious contender for the World Rally Championship title. Introduced in 1993, Subaru would only let the Impreza race once the bigger Legacy that preceded it was a winner. Compared to the later WRC cars, the Impreza 555 looked pretty much standard.
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