In my 06STi, I have the Group N engine/gearbox mounts & the gearbox Pitch mount.
Added a tiny bit of NVH but that didn't bother me, the car felt much more stable and predictable, also helped for launches and getting power to the wheels.

BTW, the engine and gearbox mounts won't add NVH to the car, until you put the harder Pitch mount in - This is what transfers vibrations to the cabin, but helps a whole lot in keeping the driveline stable under WOT.

Do it you won't regret, car felt so much better after throwing these on.

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06 STi: 337hp @23psi on E85...
06 STi: 309hp @22psi on 98ron...