Here's the GM Impact and it's 'race' version,with Cd 0.19 and 0.14 (according to Goro Tamai's study of a report on the car).
The Impact was :
*lowered 40mm
*Mirror delete
*Cowl fairing
*Strategic body taping
*Flat wheelcovers
*500mm of boat tail
These are a 'sure thing' and worth pondering
