Just wondering if I will see a noticable difference in the system speed if I upgrade from my current F900BT to a Z120BT. I also heard that the Z120BT can be software upgraded to Z140BT correct?

Just thought I'd hear from people who had both these units or installed both?

I've upgraded from an f90bt to Z140 and the difference in responsiveness is night and day.

Hmm thats nice to know - I have had my F900BT for a while now and it never had any issues after I updated it many years ago - I never bothered to update it again because it just worked . However, I wanted a little bigger screen and could use a little more speed too.

Along these lines, can I just unplug the f900BT wiring harnesses from the f900bt and plug them right into the Z120BT, or will I need to re-wire if I want to upgrade?

I heard the power and speaker wiring harness is the same but the other line out / amp harness is different.