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Interesting subject. BMW in fact built 89 635 Group A cars / kits. The first 33 of which were RA1, these were based more on the production components, suspension legs etc....RA2`s were more like racing cars with a lot of special parts.
The reason they became more competetive again in 1986 was partly due to a new cylinder head that was homologated raising the output from approx 300 to 315 bhp.
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