Agreed, not snake oil at all. However for our chassis it is not needed as much compared to cars that have modular 2 piece subframes like on VW's and Honda's (s2k, vw golf most notably).
With this, it's more of a bushing insert for reducing drive train slop, this doesn't work in the same fashion as bolt isolators to reduce excessive alignment changes. which increases steering and suspension slop.
In this case this is not a serious upgrade.
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