first, if you see tweeters in the back, then you have the HK HiFi.
Second, it is possible to retrofit at least some of the parts- however it is very expensive- the parts are not the expense- its the time it takes to install the retrofit- i asked how much to install folding mirrors into my car- the marts were about £100-200- but it would take 6 hours to install, because the dash would need to be taken apart. Thats £600 labour!!!
Get everything you can out of them -if you have a contract which says vis pack- get the lawyers on the case
