i guess the sti is different in this regard. the wrx is all the same at idle. tranny mount make shifting alot smoother and firmer. the motor mounts make taking off alot smoother. no extra vibration except for startup. the pitch mount useless.

to each their own. i would personally buy the motor mounts and fill my tranny mount with urethane. save the pitch mount money for gas, since it's connected to the firewall and will probably make alot of the noise and roughness you dont want.