I'm with Rapid. Since I installed my kit the cracks never worsened, nor did i get any new ones.
Have someone drive your car and you drive close behind it. Do this before you install the kit. You will be amazed how much it flexes. You will see the rear deck look like the sides are bouncing - eg; the space between the body and the deck at the two sides opens and closes. Almost 3/4" in my case. I thought it was the deck moving, but it was the chassis flexing. Crazy thing to watch!
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