Hi there guys. What do i need to get to fit my Alpine CDA-9857R to my impreza 99 sti v6? Is there a special harness i need to get? Can someone point me in the right direction? Thanks inadvance guys.

 

You need an ISO connector adapter like this:

Classic Subaru Impreza >2000 ISO Stereo CD Adaptor on eBay, also, Terminals Cabling, In-Car Entertainment GPS, Cars, Parts Vehicles (end time 18-Jan-08 13:42:12 GMT)

And if it is a double din unit at the moment (I'm not sure about the classics) you will need a single din pocket which you can get from a dealer, part number 66128AE000.

Hope this helps.