The onsite installer came past earlier to see my issue and confirmed that the Suzuki (Clarion) xcarlink will not work on my MY08 GTB (the fact that it works on SegR's must be a fluke).
He then suggested that the Parrot MKi 9200 can be installed and be used for music through iPhone but the sub/centre speaker won't work unless he can get the parrot to connect directly to my factory amp.
So i looked through the forums and it appears as though someone has come up with a solution, but is more than double the price of the xcarlink (including the Parrot)
Basically, i think i need to get the subaru aux cable installed to my McIntosh HU, then i have to buy a special harness from here
http://cgi.ebay.com.au/ws/eBayISAPI.dll ... OC:AU:1123 and then get the parrot hooked up so that all speakers can be used.
Parrot = $397
Harness from ebay = $100
Subaru Aux cable = $120
Thats approx $620!!
Looks like i might stick to burning MP3s to CD for now. I don't really want to install an aftermarket HU, i like the look of my dash.