Well, lets say that the owner may be a ricer at heart unfortunately. The majority of cars hooked up like that are not from people that know how to make their cars actually fast. Rather they just buy lots of expensive *blingbling* parts and say I got this and that and etcetc. I'm madfastyo!
I can tell you right now... it doesn't cost 25K to duplicate what has been done to this car (at least the cost of parts). So while a MkIV Supra TT is definitely not a ricey car... it unfortunately can be turned into a rice show queen. I estimate around $12-15k in parts.
No mentioned of changes to the turbos, fuel system, and the GCC with VPC combo isn't exactly easy to tune. No datalogger of any sort at all and the 19" wheels tells you that this owner wasn't serious about going fast but rather looking good.