I'm probably going to bring the 10ae NB, some NC sway bars, an ACT 4-puck clutch w/ HD pressure plate for NC6mt, a drive shaft for NC 6MT, some misc NA parts, a good NB coil pack, and maybe some autocross tires.
edit - Holy crap, lots more than I realized!
GWR Race Single exhaust, like new
Homemade glass pack single NC exhaust
Tire warming blankets - silver foil bubble stuff
Custom lexan wind diverter for NC, straps between headrests
Black NC rear bumper appearance package lip, cut for Curt hitch
TDR prototype CAI w filter
k&N drop in filter for NC
Hotchkiss NC RSB, huge!
RX8 yellow rear sway bar
RX8 rear hub/knuckle w/ rotor and abs sensor
Custom cold air box to replace NC air box w short ram intake
AEM dry flow cone filter, virtually unused in box
Assorted oil filters
Odyssey pc680 battery, < 1 year old
ACT 4 puck clutch w HD pressure plate
OEM NC clutch and pp in great condition, 20k miles
Corbeau FX Pro alcantara seat w custom NC brackets and MER side mounts
OEM 06 NC taillights, perfect condition
HF transmission adapter for floor jacks, used minimally
Used HP+ pad set for NC, f and r