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Victor,
My guess is that the extra stiffness comes from the IPD anti-sway bars.
I put Bilsteins and the IPD strut-tower brace on mine but avoided the bars for that very reason. By reducing the independent movement, they will definitely increase "bucking" over poor road surfaces.
I believe that your wagon came with stock bars--the IPD's are larger and therefore "stiffer." Since they come with a money back satisfaction guarantee, why not try just the Bilsteins and tower brace and see how you like the ride.
I love mine! Good luck.
Bryan
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