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For a track dedicated car yes they are a very effective upgrade especially with high grip tires.
We had (almost) all spherical bearings in our BRZ and it transforms the car. A lot of cars that I see with a lot of money on suspension forget about upgrading bushings, and it's something you can feel. Some of the chassis movement is bushing flex.
For a street car I would recommend rubber boots around the bearings or preferably sticking with rubber or poly.
We used a combination of completely custom and STI Group N.
- Andrew
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