If you choose to upgrade the turbo (upgraded compressor wheel for the 15G, or using 16T, 18T, or 19T turbos are easiest), then you will potentially be able to yield significant gains in power beyond 17-18 psi. The 15G isn't too efficient even at 16 psi, so even at the same boost levels, you will feel a gain because the air won't be so superheated. However, you won't be able to increase the boost as high on this turbo as with the 15G, because it's actually flowing enough air at those higher boost levels that you'll be needing more fuel in order to make more power (*Bill at Adrenaline Racing recommends upgrading ECU map at any level above 16 psi when using a 19T).
This is the seperating factor for this level, because fuel mods apart from the pre-made performance chips are a consideration. Larger injectors and a rising-rate fuel pressure regulator are options, as well as the possibility of a custom ECU program. Best case scenario would be a custom ECU program used in conjuction with larger injectors.
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