on number 1 that is the standard place they would put the amp so the space
is already occupied by the DAB . But the Alpine upgrade really isn't that much of an upgrade anyway.
Reccomend the Technicpnp harnesses for conversion.
He makes three or 4 different types just for the Base System
depending on what you want to do .
There are many threads on the base system it one of the most covered topics
here .
Use Advanced search in the main body of this sub-forum plug in "Base System" and limit the search
to this sub forum pages of stuff will come up.
Also this
http://www.e90post.com/forums/attach...5&d=1493273253
https://www.e90post.com/forums/showthread.php?t=1835082