Hi guys, i want to apologize for making a new thread about this, but it would be really helpful. I have an a3 from 1997 and atm im re-doing the headliner and side door cloth thingies, and i noticed my rear speakers don't work at all after changing to a new stereo unit (Pioneer MVH-S100UBA) i've seen on other posts that i would need an ISO adapter for it? And also a question i saw other people having factory subs in the trunk side panneling, i checked for mine but it's not there? Now i don't know whether i had Bose system or not car as we bought it came with Focal speakers and also swapped stereo unit.. Any help im thankful for. If picture needed i'll post it. Thanks.