Wiztecy did some research on this field in the past... but since he's gone I'm wondering if anyone else did some shopping in the Elise area. I'm thinking most underbody stuff would fit, but I haven't got any good pictures and measurements of the Roadster underside yet to be sure of this.
Imagine having an Elise diffuser, lowering drag:
or these aeroplates that do not look to hard to DIY:
Imagine having an Elise diffuser, lowering drag:
or these aeroplates that do not look to hard to DIY: