We have performed a lot of testing in regards to the vibration. This is a resonance problem and there are actually several resons for it. The first is if the dogbones are out of phase. If this happens the resonance starts at a shallow steering angle. The second cause is the fact that the E4 has roughly 15 degrees more steering throw than any other touring car. It is possible to go beyond the ability of the universal to function. The fix there is cut back on the steering servo travel. When I set up a new car I look straight down from the top. When the arm on the front hub is even with the end of the sway bar that is where I set 100%. If that is not clear then just look at your car and work the steering. You'll see what I mean. The third cause is a dimple that develops on the outdrive from the drive pin on the dogbone. When you turn the wheel the pin rides in and out of the dimple and sets up the resonance. The solution for this is to either replace the outdrive (503234-1) or using a dremmel tool soften the ridge so that there is a ramp instead of a dimple. The fourth reason is the design of the spool itself. The pins that secure the outdrives to the spool allow a lot of wobble. You can see this for yourself before you put the spool in the car. What we have found is that if you apply a tiny amount of rubber cement (the stuff you used to sniff in school) or shoe goo on the spool / outdrive mating surface it does a great job of dampening the vibration and resonance. The shoe goo works better but if you use too much it is really hard to get it apart. Hope this helps

Wolf