BMW Mini Cooper S for BMW race series?

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I'm thinking of either an E30 320 - 325 or BMW Mini Cooper S for the Targa, plus entry in the BMW race series. Would the latter, the Mini Cooper S be eligible for the 2lr Open Series or similar? I've had an E36 M3, which I drove in the Targa for five years, but am keen to go for something a little more basic and maybe less expensive. Any advise welcome please.

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The BMW Mini is eligible or the series.  2 litre is a naturally aspirated class only, but the Mini could also run in Open class if it is supercharged.  There were a couple of Minis running at the last round, one in 2 litre and the other in Open.  They went very well in the rain.