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Go solid, whether it's aluminum or delrin. I tried poly inserts, full poly and, finally, solid.
Poly inserts: Total waste of time. Anyone who says otherwise is trying to convince themselves its an upgrade.
Poly bushing: Gets rid of 80-90% of the unwanted subframe movement, cheap, and will be enough for most folks
Delrin/Solid/Alum.: No added NVH, 100% fixes unwanted subframe movement, and makes the car ride so much better because the rear shocks aren't squirming around as much.
Those Condor Speed ones posted above are a steal of a deal, and having used their products extensively, I bet they will do the trick.
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