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If you want to start going down the spec road, which I'm sure will exist for the twins, I'd start with the known quantities- get a really nice certified cage in there, strip the interior, get the right seats, harnesses, etc that are generally accepted in the spec classes. That work alone would probably buy you enough time and effort to figure out the spec parts to go with.
Keep us informed what you find out- twins spec racing sounds AWESOME and I can't wait for it!
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