I think there are a few other similar threads you might find through the Toymods search tool.
When you say with a T04 turbo, what other modifications would be done? I would say that it would be virtually impossible to get anything more than 200rwkw out of standard 3T-GTE internals (although Jason may be able to prove me wrong).
How much horsepower would make you happy?? Note that is around 300kw at the flywheel / or around 400hp at the flywheel.. which is normally enough for many people!
This would be good for around a 12.5 sec quarter mile with around a 185km/h trap speed in a TA-22. - Would you be happy with that?
Sure putting on a bigger turbo makes it capable of more power, but anything more than 200rwkw would require spending around a grand on some forged pistons at least.
How much would you be willing to spend?
Cheers,
3T-GTE