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On the 'handling link' (#25 in the picture), the FE4 version has a spherical bearing on the inboard side of the link. The regular FE3 link has a rubber bushing. The bearing will provide better steering response/feel.
On the 'ride link' (#26 in the picture), both the FE3 and FE4 are hydraulic (fluid filled) bushings. The FE4 is marginally stiffer, the difference probably isn't worth the cost, IMO.
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