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if they actually worked i would think they would create some NVH.....any time you stiffen the car up in some way, it will be a harsher ride with added noise IMO....but then again, these would actually have to work to do that.
They arent needed......its been beat to death on the forum.....i do like how some people that have them agree that it doesnt do much and if it is its just the placebo effect, most people who have bought one swear it is doing a great job at making the car stiffer....