I installed a single X-factor in the center when I was installing the wet bolt kit. I live in a cul-d-sac and have to make a bit of a tight turn when ever we come home. Being an engineer and thinking about the stresses involved, it just seemed like cheap insurance. It was easy to install, and fit perfectly. It was a one-piece unit, as apposed to what I have seen on the web site.
Between the wet bolts, and the X-factor, it has virtually eliminated all of the popping and snapping noises I used to hear during any sort of 90 degree cornering.
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