V8, and GS-IIb, which used a lightweight chassis and reportedly achieved  at Jim Hall's Rattlesnake Raceway test track. The GS-II was styled again by Larry Shinoda.
The V8 and GS-IIb models featured a minimalist chassis and demonstrated impressive performance at Jim Hall's Rattlesnake Raceway test facility. The GS-II underwent a redesign by Larry Shinoda.