What the heck happened? 

There are multiple failures here, the hard part is figuring out what happened first. The burst oil line was the last thing to happen; that was a result of the headers smashing the line against the engine compartment. The subframe is ripped out of the right framerail. One bolt is pulled out, the other bolt is missing. The right framerail is bent up from something. There is a tear in the framerail at the rear subframe bolt. The subframe is partially ripped out of the left framerail, but the left framerail is much more damaged. It is bent up all over the place, and there is a rip along the side of the framerail near the rear subframe bolt. The right motor mount top bolt has been ripped out of the solid aluminum. The left motor mount bracket is cracked in two. What the heck happened?

Slightly out of focus picture of the completely split left motor mount bracket.
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Slightly out of focus picture of the completely split left motor mount bracket.
Viewed: 357 times.

Top of the right motor mount.  Hole is where the stud used to live.  It has been pulled out.
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Top of the right motor mount. Hole is where the stud used to live. It has been pulled out.
Viewed: 338 times.

Burned, crush and broken AN12 oil line.  This didn't burst until the car sat in the paddock for a while.  It was beaten to death by the headers smashing it up against the right frame rail.
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Burned, crush and broken AN12 oil line. This didn't burst until the car sat in the paddock for a while. It was beaten to death by the headers smashing it up against the right frame rail.
Viewed: 310 times.

Dented right frame rail around the rear subframe bolt.  Frame rail is dented all over the place (from the headers, I think), and there is a big tear around the captive nut.
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Dented right frame rail around the rear subframe bolt. Frame rail is dented all over the place (from the headers, I think), and there is a big tear around the captive nut.
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Closer view of the tear.
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Closer view of the tear.
Viewed: 323 times.

Tear in the bottom of the left framerail near the rear subframe bolt.
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Tear in the bottom of the left framerail near the rear subframe bolt.
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New scrapes on the front sway bar tube.  Something was bashing around down there.
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New scrapes on the front sway bar tube. Something was bashing around down there.
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View of some of the left framerail denting.  Also note that there is now a 1/8
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View of some of the left framerail denting. Also note that there is now a 1/8" gap between the framerail and the subframe in the rear, so it pulled out too.
Viewed: 352 times.

The left frame rail seems like it might be bent inwards, in a curving shape.  It's hard to tell, and I haven't tried measuring yet.
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The left frame rail seems like it might be bent inwards, in a curving shape. It's hard to tell, and I haven't tried measuring yet.
Viewed: 349 times.

Overall view of the right side damage. Note the severe pounding the frame rail took, the missing subframe bolt, the missing motor mount stud, etc.
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Overall view of the right side damage. Note the severe pounding the frame rail took, the missing subframe bolt, the missing motor mount stud, etc.
Viewed: 356 times.

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