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Maybe your strut bar is rubbing against the top of the plenum. I don't know if that's actually it, but you might want to check. Make sure there is at least 2mm of space between the bar and the plenum. I had a strange vibration when I installed mine and I found that to be the problem.
That might be it, i forgot to install the washers on the passanger side that come with the kit, thanks man!
