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Do the new Perrin mounts weigh the same or more than the stock mounts? That's the rule for STX class, you can run any mount you want as long as it doesn't decrease weight.
There are BRZ-specific STI mounts now which are basically just much stiffer rubber. I'm not sure I see the same issues happening with those as the Impreza ones due to how much material there is, and there is quite a bit less force involved with launching a BRZ vs. a STI.
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