If you are handy with wrenches it's possible to do it yourself. It's not rocket science but can be intimidating.
06' LGT Wagon. BNR16G, Catless UP, DOWN, Hexmods VB, Hexmods diff bushings, BIG TMIC.
Best 0-60: 4.651, Best 60': 1.899 measured by AP, 1.897 at the track.