[richs347]

x2...

The Kenny Brown ones have several braces in addition to the typical subframe connector which offers more support. However, the bars are not extremely beefy and I would be scared to balance a 3400lb vehicle on that thin bar.

Find a manufacturer that uses the full length - much better for stiffness. When you have someone weld it in, make sure the car is resting on all four wheels and not on a 2 post lift. Otherwise you will probably weld the car together with a slight twist to it.