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Just a couple added thoughts:
The stock Carrera, especially at "USA ride height", generates lots of lift (and drag, but that's for another thread.) At the front, the lift is caused primarily by air being forced UNDER the car, resulting in John's "definitely feels scary light at that speed".
At the rear, much of the lift is caused by the 911's "airplane wing cord" body shape - air passing over the roof and tail faster than that traveling underneath the car. Thus, Tony G.'s "the back end will be loose on cornering at higher speeds".
If this is true so far, think for a moment about the effect of drastically reducing lift AT ONLY ONE END. Fix the front, the rear "becomes" worse! Fix the rear, and the front becomes undrivable at high speed.
At least before, the Carrera had lift at both ends - now it is totally UNBALANCED.
The solution: Limit air being jammed under the front of the car, AND interrupt the smooth flow of air over the roof and down the engine lid. PRESTO! Less lift all around, more "stability" as Brian aptly described it, and that nice, balanced feel that Ricky V's car has achieved.
Now, if you really want to get fancy (and achieve unbelieveable stability at speed), the next step is to apply aero downforce in the same distribution as the car's physical weight bias front to rear. Or maybe just use a chin spoiler and a duck tail.
Ed LoPresti
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