necessary upgrade in acessaries for swift vxi

hi everybody,

                i am planning to buy a preowned swift vxi ,just want to know how important it is to get a good security system ,i think the vxi already has a factory fitted one but the older models (before 2007may) dont have the ICATS system.is is advisable to get this retrofitted on older models & is it compatible in the first place?

also is it advisable to get antirust rubber coating done again and also the teflon coat.?

apart from these are there any other accesory that needs to be added /changed or upgraded.

thanx

reggie