Hey,
Im not a 32 owner but I assume you're thinking of an R32 gtst.....
Not sure about problems with those...
I'd pay about the 10-11k mark for a neat example...
Mods cost roughly what mods to other turbo cars cost, unless its a gtr...
First mods to do: exhaust-at least catback, induction, maybe a front mount intercooler and some more boost, then you upgrade brakes and handling..
Hope it helps