If it's a pukka 1987 Group A race car then it will have a 2.3 engine (Cosworth built the first ones didn't they?)
The 2.5 first raced in 1989 IIRC in the DTM followed by the Evo Batmobiles 1 and 2 in 1990 onwards.
There was never a 'proper' 2-litre race car, only those that were later converted unsuccessfully for the Class 2 Super Touring series in Australia as Bill Dale Jnr kindly mentioned.
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