I'm going to install the WRX 332mm kit next week and will post any impressions from normal street driving. Despite what Stoptech says about installing the WRX kit on the Legacy, the numbers suggest that it would only shift bias about 8% rearward. The 06 wrx with 4/2pot brakes has a 67/33 factory balance and that is how they came in the rest of the world for years.
I think using the 328mm wrx kit would be a pretty aggressive shift to the rear because the piston sizes are the same but the rotor size is smaller.
I'm hopefully this will actually help keep the car more planted under braking and reduce dive.
For anyone who wants to run the numbers, the LGT kit has 3*/4*mm pistons vs the WRX 3*/4*mm.
Have a great Holiday!