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BRIAN'S APPLICATION NOTES: In track and autocross use the factory mounts are not stiff enough to prevent driveline twist that will make it hard to shift when trying to shift quickly. Those tracking or autocrossing their Miata should replace these every year. If you want something that lasts even longer, see our complete upgraded mounts with urethane bushings but those are MUCH stiffer and will mean more vibrations in the dash, etc.