Lots of people have said that the stock pistons in a Cobra are not strong enough to sustain supercharging.
Here are some interesting articals on Cobra pistons:
http://www.alternativeauto.com/water...rcooler_update http://www.alternativeauto.com/water...m.html#autopsy
www.alternativeauto.com
750 hp, 26 lbs of boost, and 8500 RPMs... That's pretty freakin strong. Its especially interesting that the over-revving lead to the final demise..