The 3" bar would effectively nulify your independent suspension and make it similar to a solid rear axle. The stiffness would be so high that all the weight would be supported by the other three tires when one encountered a hole. When a bump was encountered it would raise the other wheel off the ground. End result over rough road would be less tire touching the ground.
warmonger
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
See My Mods
'05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red
'06 Mazda5 Touring, 5spd,MTX, Black