How much would this cost?

Well, that is an 03 Cobra with the ProCharger on it....that motor is already forged. Sooooo, if you wanted to do something like that, parts and labor, I'll say around $16,000 or so.

That would be all labor, the supercharger, forged bottom end, fuel system upgrades, tuning...everything.

Then you would have to address the IRS...or go to a solid axle.
Oh, and the tranny might not last long, so save another $1700-$3,000 for a new tranny, clutch, and more labor charges.

You can save a lot of money if you do all the work yourself.