Stop Bluetooth Auto Sync Contacts to Pioneer Avic Z140
The filtered contacts list solves this problem, but unfortunately if you are like me you are constantly needing to look at the larger list of contacts and you will not remember to turn the filter back on afterwards. So when you get back into the car, it will start sending the whole list again. I just found a workaround.

There are a ton of alternative contact apps in the marketplace that will sync to your gmail contacts. I installed GO Contacts EX https://play.google.com/store/apps/details?id=com.jbapps.contactpro&amp;feature=search_result#?t=W251bGwsMSwyLDEsImNvbS5qYmFwcHMuY29udGFjdHBybyJd

It appears that the bluetooth address book is only controlled by the stock contacts app, which I've left filtered. I banished the stock app from my home screen/launcher. All good now.