I dont know how much these will flex, I have a pressure guage on my press and it took 10 tons to get these to bend where I wanted them. I know structurally they would have been better cut into the floor pan, and set in length wise up and down, but this will be fine for now. My charger has some cheapo bold inn connectors, that have been welded inn, and they are way lighter than these. That car ran in the 8.50s. Im not worried.
