BTW the K does a lot more than hold the frame rails straight. Again, some things you can't measure statically. It has to support the lower control arms as pointed out, and also support the engine as well as counteract the torque.
Just because the aftermarket K frame doesn't look as big as the factory, doesn't mean it's as strong, or stronger...
A Torsional Rigidity test can be done with the K installed or not, the better the rails are without the K installed, the better it will be with it installed.
My suggestion would be to twist the K members out of the car.
CR
These are the exact things I was talking about in this thread.
What are you getting for your money? Is it any improvement over the stock hardware? What kind of rigidity will it add to your car?
I have the tools, material, and metrology to build a rack to use for testing out of the car.
