i know this may be a dumb a-- question please don't rag. i do love my Z.
can i add an amp or two to the stock radio/cd unit in my Z. and keep the stock unit. i've already bought 4 new alpine speakers still sounds rough. am adding 10 sub next. just like the looks of the stock unit. thanks in advance.

 

no amp or sub on stock unit. You need to upgrade your HU.

 

Yes, but your amp will need high level inputs or you can get an outboard line output converter for a few bucks.