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Uprated mounts will reduce engine movement and eliminate the classic exhaust knocking on the subframe problem! Only thing is they do increase vibration on idle as there is far less give/play in the mounts, however, they will last forever.
Standard mounts are good for replacement and you will notice the difference!
I would do both upper gearbox and engine mount though if your going to buy uprated mounts. better to do them in pairs.