loyd87 wrote:I know that Tiida in Japan can be AWD in option.
Somebody may know how to get this part for importation?!
As others have pointed out, it's not an AWD, but an electronic 4WD that the Tiida uses (e・4WD). It's basically a get-go system that helps with the traction from a full stop, and does zilch once you pick up speed. The system automatically cancels itself at 30 km/h and/or when the transmission is in anything other than the 1st gear. It's a very limited system that gets a lot of people in snowy parts of Japan into trouble because they think they are driving a full-blown AWD/4WD when they are not at all.
In conclusion: not worth a retrofit.