Hi all, I have a 2003 Audi A3 with the bog standard CD/Radio and I have had enough - Ultimately I would love a decent sound system but haven't yet got the cash (new child, etc) so all I am after is a head unit that has USB. However, am I correct in thinking that I will need a few pre-outs if I am going to go the amp and component speakers route? I don't mind second hand if there are any ones on here? Also, will I need a conversion kit to change from the current HU to a non-Audi HU? Thanks all.