A little re-hash...

From their site: "Your Mopar’s uni-body construction is inherently weak. Our G-Machine Chassis isn’t.

The sheet-metal that your suspension components and engine are mounted to begins to flex dramatically once you add more horsepower, higher spring-rates and better brakes."

What a crock.

Compare any perimeter-frame car of the '60s to any Mopar of the same era. Drive a corner of that GTO up on a curb...you can't even open the door! And the Mopar was lighter, etc. The only downside: Noisier and a bit more ride harshness.

Look at all the modern stiff / handling cars: ALL are unibody with rail-thru construction (BMW - Mercedes, etc.) all pirated from B-vans and Jeep Cherokee designs!

I have no doubt that adding a perimeter frame to the unibody will create a very stiff platform -- the factory has done that (Imperial). But, what's the weight penalty? You can get the same effect with frame connex, torque boxes, and the XV braces, which, in total, add maybe 30-35 lbs.

Rick