Think about it all the road race/drag race car's that do back fire and pop a flame from time to time or the drag race car's that come up on the 2 step or antilag they all throw fireballs and still ive never seen a turbo come apart like that. Im guessing the chra fucked up and seized and it snapped. The other size still shouldn't be showing signs of problems already as well. Has JWT offered to warranty these for you? Seem's like a defect of the turbo them selves.
2006 Chevy Cobalt SS super charged (Daily driver/Gas saver) 1994 Nissan 300zx Twin Turbo (Weekend car) www.SVZA.NET