So again, you had already formed your opinion and it appears that you were just looking for people to agree with you?
AC Cobras? GT500? Seen any of Carol Shelby's new offerings? That's like arguing the GT40 is faster than the new Ford GT. Any one of them will best either of those cars. Go for the Rousch Rasing Mustang with the independant rear and it'll go faster around a track than the new Shelby's or the supercharged Saleens. There's a reason those cars race in a "vintage" series.
993 Turbo? You're either not running into the right cars, or not finding an equivalent driver. If it's the latter... well, good-on-ya! In reality there are a handfull of models under the same marquis made since the 993 Turbo that are faster around the track (GT3, RS, RSR).
Exactly. People confuse a more visceral ride with a faster car. The pitfalls of the butt-dyno. Again, the R53 (JCW or otherwise) has some things going for it that the R56 can't touch. Looks, steering feel, intoxicating SC whine. But when it comes to what moves around a track the best? It's the R56. Track times prove it. Autocross results prove it. Drag & roll-on times prove it. But go ahead and tell yourself otherwise. Whetever makes you happy while motoring along!