i dunno, what whp are you at right now? what are your other mods?

 

I don't have sc yet but am debating on getting the 3.12 pulley. This will be on an auto g35 coupe with h/e/ hi flow cat. I'm about to purchase some 380cc injectors and I'm afraid it might be too small. I heard the 380cc is good for around 385 hp at 90% duty cycle so will I be around that range with the 3.12 pulley and tuned with the unichip and walbro pump?

 

IMO i'd go for 440 injectors - trust me when I say it's better to have more injector than you need than not enough. I was hoping 440 would be enough for me, and ended up needing to go to 550's

 

Did I really here someone say this. So an air to water intercooler is not a real intercooler. Last time I checked an air to water intercooler was a very effective way to intercool a FI motor. You should tell some high end sports car manufacturers that, maybe they made a mistake. The air to water intercooler is very effective on the roots based supercharger because the circulating water moves the heat away from the plenum so that it doesnt heat soak. Its a fact that water dissaptes heat better the air in certian applications. (I said certain applications like the stillen set up and others similiar to it) As long as the heat exchanger is mounted where it can recieve sufficient air-flow like the stillen is mounted it makes for an extremely efficient system.
To answer the original question. You can make 350 HP easy on any one of those kits. The stillen stage 4 properly installed will get you close but not exactley 350. Its about what kind of powerband you want. The vortech and ati, make power but there peak HP is high in the RPM range. The stillen since it;s a roots makes power instantly most closley resembeling an NA car. smooth linear powerband. I have ridden in an ati, and a stillen. I personally like the powerband of the stillen better for me since off the line acceleration is what i like. Thats just my opinion. The vortech and ATI are great kits. But you cannot compare any of the SC kits to a turbo. totally different animal with much more upward potential. My .02