well heres the scoop...

you need a turbo... not only that, but if you want more than 200 HP from this turbocharged F23, ur gonna have to build the motor (replace pistons, rods, bearings, new gasget, new engine management). The engine wont take about 7-8 psi safely and reliably. Someone got it to 10 psi with dyno tuning and etc... But his engine finally blew i think...so go that high at ur own risk.

~200 Crank Hp / 6 - 7 psi
Turbo Kit: $3,500 (ball bearing: +800) (water injection: +600)
Turbo Install: 600 - $800
New Clutch: depends
If its a auto...trade it in for a manual first or get a (pretty expensive) level 10 upgrade

200 - 280 Crank Hp / 8 - 14 psi
All above plus...
Rebuild of motor + all parts + engine management ECU + upgraded fuel system = ~ $5,000 - $7,000

I made the mistake of buying a turbo kit thinking I could boost 8-9 psi reliably and not have to worry about engine or transmission failing. I was wrong. I am now saving for an engine rebuild.

Hope that helps.
Kosh