better spend the 3k on something better and worthwhile. mod wont make your myvi any better. wont even increase your resale value, lol.
if i were you just improve the audio system (radio, sub, etc). or add a gps anti theft system (katsana).
then use the rest on something you need, not something that you want (modifying your myvi).
Cheers
Basic or simple myvi modification, Which part to modify ? Q&A