^^^I agree for the most part but why be statisfied with just a "little stiffer". Either try to make the chassis as stiff as you possibly can or not. Why half-a$$ it ??

Since our car are unibody, the Inner and Outer rocker panels along with the floor pan, are the "Frame" right? With that said, to get the "most" chassis stiffening when installing frame connectors you should:

1) Weld as much of them to the floor pan as possible. The contoured ones XV and a few vendors sell are nice and are the next best thing to huge square tubing.

2) Box the front the rear of the Rocker panels, A-la' convertibles and hemi cars. Don't be fooled thinking thin sheets of metal are a waste. They work.

Other aftermarket tube connectors, if availible, aren't near as good plus they cost more.