Unless you've very heavily modded that Mustang an SRT6 will suck it's headlights out in a straight up drag race and run circles around it in the twisties. The two cars are very, very different rides - Road & Track put the SRT6 up against the Boxster S and Nissan 350Z Nismo and picked the Crossfire as the winner.

Hell, even with my little Limited Roadster 6MT I've kept up with, or caught and passed, some nicely modded Mustangs on a road course. And bang for the buck, nothing even comes close.

Plus you won't see 500 a day like you do the Mustang.

And I happen to like Mustangs - we're considering one for my wife's new car in a couple of months.