Flaming River Power to Manual Adaptor

I got the flaming river adapter and am pleased with it. However if I was to do it over I would probably use the borgeson piece as it's a bit less expensive. The one thing to keep in mind is the conversion pieces are rigid and have no ability to slide like the factory pieces to accommodate for chassis flex .So keep that in mind also. Is your car stock or does it have any additional chassis stiffening? Like subframe connectors,roll cage, etc?