What's the potential of GSR 4G93T?

[InitialD]

I wonder a GSR engine can mod to produce how much power?
Got this guy who rebuilt his GSR into a 434HP monster
http://www.ignitionmagazine.co.nz/cars/44

 

[Fluffy]

1st of all..i would say how deep is ones wallet?
coz that makes the most sense.

but if u dont put money in the picture...i cant say either.very subjective.