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I am not sure Toyota is installing a 'stiffer suspension', as in harder springs/bushing and tighter dampers. My impression is that Toyota is trying to improve handling and ride quality by:
1 Increasing the rigidity of the suspension set-up; (with bigger bolts) and
2 Reducing internal friction (or sometimes called stickion) of the dampers. The usual way to reduce internal friction is to use a hydraulic fluid with lower viscosity, and increase the rigidity of the damper body and rod (hence thicker rod). Because internal friction increases exponentially when the damper bends (or flexes) under stress, and a strong body and thicker rod bend less under stress.
I doubt if the ride will feel much stiffer after the 2015 modification.
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