I got to go for a all day ride in the 03 Cobra prototype, the exact one pictured in Motor Trend and we tested that car if you know what I mean to see how big its balls really were and let me tell you they far outweigh any stock vette. Ive never been in a Z06 so I can't speak on that matter, but the ride quality was better, the pull through all gears, the cornering was better and the looks, well you've seen it, Better,Better,Better. I would take an 03 Cobra over that Chevy **** any day.