Good catch, I didn't even notice that this car didn't have the area above the rear mounts sewed up from reinforcements underneath. Though I did have those reinforcements before as well, as part of the turner kit. Yet my car experienced similar tearing, though it did not tear where reinforced, it tore around the welds. on the front right mount point, and moved it a bit and that tear went past much of the gas tank.That car doesn't have the welds in the trunk reinforced. Once those welds separate, the mounts flex and tear badly. If the plates are welded underneath but the trunk welding is still damaged, the entire floor just keeps getting hammered. We have been highly suggesting everyone that has the reinforcement done at our shop to have the trunk reinforcement done in addition to the four mounts underneath the car. We have seen a few cars that were even worse than this. One was not salvageable because the welding labor would have been cost prohibitive. one of the worst cars that we repaired had the entire diff dragging on the ground with all four mounts completely torn out of the body.