Just want to share, Perodua has introduce the new Myvi SE1.5 Manual GHM which features Multimedia System with Navigation where the standard SE1.5 manual transmission doesn't have.
click here for pricing--> Myvi SE1.5 GHM
Basically if we went to the service centre and ask for the myvi upgrade parts catalogs, they will quote us around RM3k (if I'm not mistaken) to install the Multimedia unit. We could also went to accessories shop but the cheap ones that they have might be similar but not the same to those oem. You can even verify them by looking at the layout of the control panel itself.