Hi ther i have an audi s3 8l (2002) with the bose system, im looking to replace everything! New speakers new sub and amp and new head unit. i was just wondering if any one can help me as not sure if to get some kind of adapter for the existing loom or just start all over :/ what will be best? if i do just start over will it be ok to just leave the old headuit wireing loom were it is or take it all out ? speker wires same deal. any help with this will be much appreciated all the best and thanks p.s sorry about spelling and grammer pps any ider what tipe of head unit will fit?