I was also concerned with this but took the chance and it's really been much better then I expected... I dont even notice a differnce on the road course the 3 times I've taken it out since I've had this done. Granted I'm no professional driver or anything but it still handles to me like the day I bought her. The steel I used for the pans in the floor was stronger steel then that of the car so that I'm sure helped negate some of the loss down there... My concern was the kick panels where I needed to remove some reinforced metal there... but like I've said I've noticed no change. Now granted I'm sure body rigidity was lost... I mean it had to be... I'm just saying it's not noticeable to me surprisingly ... even on the track. I have recently considered getting an inner fender brace to attempt to correct the rigity I have lost on the side... again not so much because I feel like the cars a snake now or anything... just cause like you I know ... Rigidity HAD to be lost lol... even though i don't feel it. So I'd like to try to get some of it back.