I was gonna say that there is no 2005 Cobra, but someone already chimed in.
I do have some tentative specs for the 07 Cobra that should be out by Spring or Fall of 06.
3 or 4 valve heads, 4.6 to 5.4L, twin screw supercharger (same as the Ford GT with a smaller pulley), IRS, big front and rear brakes, and a few other goodies. From what I've heard it should be putting out around 440 to 450HP. Now, if the trend continues from the 03/04 Cobras then it will be putting very close to that number to the wheels. My mom's put out over 390 to the wheels with just exhaust and intake and hers is an 03.
The beauty of the new Cobra, GT (not Mustang GT), and maybe Lightning motors is their over-engineering. The current Cobra will do a little over 600 to the wheels without any internal work. After that, the ring lands on the pistons don't hold up well. The Lighting is good for 450 to 500 to the wheels, and god only knows what the GT will hold up to. I've heard they are putting over 550 to the wheels, stock, and over 700 with pulley changes and a few other things.
9.8 sec 1/4 is BS and anyone with any minor knowledge knows that. I have seen a fully streetable 03 Cobra push high 8s. I do know it was pushing over 1000HP to the wheels running quite a big turbo. I believe it was X2C performance or something that built the car.
Anyway, the Z will go much faster without nearly as much horsepower.