Sup... i am trying to make around 600ish rwhp.. I am looking at the A-spec GT42R.
What are the supporting mods i need to make this power?
All that the car has now, is a 3" exhaust/power fc/...
Thanks for your advice!!

 

600 whp huh? thats a pretty big goal. You definitely have the turbo for it, you will need some pretty large porting done to the motor (large street port or even half-bridge) Also, much more fuel, 850 or 1000 primaries or even larger, and 1680 secondaries, step up the fuel pump to dual nippondensos or an aeromotive a1000 and a surge tank. I would also step up the ignition, MSD 6a and msd coils work very well. Thats it for now, i'm sure others will chime in too.

 

Since your in miami, why dont you check crispeed,he's also on the forum. He can get you there.

 

dont go msd, just get an hks twin power

 

im not sure what all you have done to your car so far but here is a list of stuff to think about:
bigger injectors
eneough fuel pump to feed the injectors
good radiator
fmic or vmount
porting
ignition
exhaust
standalone
boost controller
maybe some AI for det supression
a good clutch
a good tune
im sure im missing something but this is astart

 

Upgrade your whole fuel system
DP, MP, catback (straight pipe)
HKS Twin Power Ignition
Agressive street port or Half or Full bridgeport
Rotors need to be balanced
Race bearings
2 piece eccentric shaft
Good intercooler setup
ECU
Exedy twin plate clutch
Good tuner

I'm getting all of that and a lot more done to my car right now from PFSupercars and the bill is 13k. It's not cheap.