yes you can you can get a sony or kenwood changer but you will also need the appropriate connects2 vw to sony/kenwood changer adapter can't give you the part numbers till tomorrow as i do not have my catalogue to hand
it is a special converter that allows a kenwood or sony to work with a gamma unit
Are you after in dash or boot?
sorry its taken so long to get back to you about thisthe only aftermarket changer that can be fitted to the factory unit is a sony 6 disc changer and you will need the connects2 adapter part number CTAVGS003 http://www.awesomeautomotive.co.uk/catalog/product_info.php?products_id=781&osCsid=570e0b9c836bec1032e9d5cd54c5131d
any of the sony 6 disc changers will work