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I've only just seen this thread, so sorry for digging up old ground. The coupe rear of the Roadster is not interchangable. The Tridion chassis is different for the coupe and the notchback (as the other version is generally known). I've not started my aero mods yet, despite having the car for a year. I've been thinking about a coupe conversion kit and it's high on my to-do list. As for an undertray, the car still has one. I'd not thought of doing wheel skirts but I might just run some coast down tests to prove the theory.
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