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I think you already know this but just making sure, you need bigger injectors to run 22psi. I would go with 660's for that psi.
The turbo that fits that psi and price is the 15g, make sure you get the TD04HL compresor housing on that turbo, it costs a little more but its bigger and worth it.
When you figure that HP gain you are assuming the same hp gain per psi. When you get a bigger turbo it will be more efficient, and therefore make more power per psi. In short, 15psi on the stock turbos is far from 15psi on upgraded turbos. With 22psi you should be in the high 400 AWHP range, but you have to watch knock. If you dont have a logger, now is the time to get one.
To run that much presure you will need a way to cool the air or up the octane of the fuel to prevent knock. Water or alky injection cools the air and allows you to run 2-3 psi more. What im going with is propane, it raises the octain of the fuel and allows you boost 7+ psi more than without it.
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