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seem like a great idea, but over the years I've learn something that the bushing should be made of rubber since they do absorb vibration, since metal bushing on metal does not seem to be a bad idea however you will have noticeable vibration emitting throughout the car so hence the rubber bushing aids to dissipate the vibration so why do you think motor mount would be made of rubber. Good luck on the group buy.
C's performance made these for me , hes big In the p10 and g20 world ( group buy is over for 5 sets sold total)
Also my car has solid motor mounts , plus every item Matt offered back in the day ,subframe connectors , so vibration isn't a problem lol and most ppl who have bought these already know the deal and are turbo and fully built cars