I did the same with NOS aswell!
Seems to say its used then gone in one part of the site but refilled in another
I've got
1) Air Filter
2) Stage 1 wheels
3) Roll cage
4) Stage 1 exhaust
Don't think the wheels or roll cage do anything except unlock performance parts
Nearly got enough for the ecu
EDIT: Just races midzt and he's deffinately just bought an upgrade...thrashed me!