Just to give you an idea about turboing a K24.
I've got a Haltech running the fuel and spark on my car. There is no problems AT ALL!!
I'm thinking about turboing my car now.
I've spoken to both Hypertune and Haltech about the job and they said there is no problem at all with the job.
I would be looking at a internal wastegate GT30R with a front mount some bigger injectors and the unsual stuff that goes with it.
I would put back the stock airbox and i'd also leave the stock cat back.
Just so its quiet and so the cops don't hound me.

I've been quoted around 180fwkw with lots of torque everywhere.
This would be throught the auto and about 5-7 psi.

Hope this helps out with this topic.
Cresa give us details if your going ahead with it.