Yeah, that is a draw back of the vibration damping unit. Hopefully it clears my Doug's headers. It should, it's just a touch smaller than the stock coupler on the wide part of it. Of course if it doesn't I'll just switch it out with a plain steering u joint, there should be more than enough extension in the telescoping section for that.
As far as a difference, its not on the road yet. No engine in that picture...:D