Unibody chassis "flex" and move under stress/cornering/offroad excursions and just regular driving. In therory the suspension mounting points take most of the load. Anything that can tie the stress points together can reduce movement and make the handling more predictable. At the same time it should make the ride better especially on an older car that has softened up.
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1996 Pontiac Bonneville SE 3.8L V6
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