I don't know what differences were really made.
The '99 Cobra got some minor tweaking. The extra 15hp was not reflected in performance. Truth was, SVT goofed, they mismatched part of their new combo and the Cobra was still making 305hp. After owners backlashed, SVT took a look, they recalled the Cobra's and added a "fix", I think it consisted of a new exhaust, and some intake tweaking. Not much, but the 320hp re-appeared. With the fix performance dropped standing quarter mile times from about 14.0 to 13.6. The Cobra also picked up 17lb/ft of torque in ratings from 300-317 from 98-99. Once the fix was applied, the performance gain was notable.
It is however, not worth noting if you mod the two cars. You'll already be adding superior exhaust to your car (I hope) if you supercharge it. Once that is done, the performance difference bettween the two cars is pretty much negated.
I have no idea how strong the rear end on the new ones is.
Post in modular madness, they are the gurus!
