Hmmm...
I think the man you need to talk to is Ben Martin
200rwkW is possible on the stock turbo but it's a freak thing where a good engine + a whole bunch of cheap mods (ie, dumps, EBC, FMIC) may get you there.
I would bargain on a lot more mods to get 200 RELIABLY day in day out like a good turbo like the HKS 2530.
The ECU is reasonably irrelevant, it may get you a few kW but it comes into it's own with you get up into the 225+ class.
200rwkW means something like 250 crank kW so it's a fair lot.
Something like 268rwhp.
T.