I used add on ADDCO sway bars on several cars and they regularly pulled patchs of the floor out of the cars, due to stress loading..... Remember when I lowered my seat, I added a strap between the new bolts for strength, lesson learned.

There is a lot of force being liberated on to the chassis to let the weight transfer function of the sway bar come into play. We may wanna get into a stiffener to prevent frame / floor tearing. Woody