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Originally Posted by IT L GO
To me there is a difference between C/D and Aerodynamics. At high speeds the Hardtop design gets down right squirrelly compared to the Coupe. Why do you think John Lingenfelter chose the Coupe when he made his 226 MPH run? 
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My guess would be because he thought it would give him the highest top speed. I agree completely that stability is important, but in that situation, speed trumps it. It's no good being stable and slow.
In any case, most of this stuff is a non-issue for street cars, so making it one is a design choice in itself. Arguably, they could have continued basing the racecar on the coupe and still built a separate notchback- they still build a convertible, and it's not race-based. That said, I'm not sure their motives and future plans are completely clear at this stage.
My point is that while claiming to be doing things for maximum performance, they've also done a number of things that undercut achieving that goal. They want low drag, but they've shortened the car; they want torsional rigidity, but they've made it a notchback. It's the double-talk that I object to.
And I'd still like to see an aftermarket hatch piece that has a shorter rear glass and more SMC like a notchback.
And thanks for the pic, PerforminNorman.