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The last upgrades you can use to boost handling characteristics, are the Increase Body Rigidity & Roll Cage upgrades.
With no scientific way of proving what these upgrades do, so we have to use personal interpretation of the change in car characteristics. The following will be my personal interpretation of what these upgrades change. I feel these slightly increase the stiffness of the chassis, resulting in slightly less chassis flex. I've never found these upgrades necessary unless there is a fundamental problem in handling, that cannot be solved by 1 Stage 1 Handling.
I have only used these upgrades for greater control of weight transfer as long as Performance Points do not increase by +1.00PP. Older generation vehicles and engine swapped vehicles are prime examples of where a stiffer vehicle platform is needed to control the weight transfer at higher speeds.
Increase Body Rigidity increases chassis stiffness.
Roll Hoop has no effect on chassis stiffness.
Roll Bar minorly increases chassis stiffness.
Roll Cage A, B and C slightly increases chassis stiffness.
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