First thing I would ask is if you don't understand the benefit rose jointed items then what makes you want to do them?
Rose jointing is for race/hard track applications only, it will stiffen everything up and will allow for more finite adjustment in your car setup. I wouldn't recommend them for road use, they will put more stress on other components and make the car louder, more rattly and stiffer. For most people poly bushing is a far better idea
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