I'm sure I saw the 2, 3, and 4 PSI additive boost levels for Sport, Sport Plus, and Race when I first researched it. It also has 0 PSI or bypass, and Valet which is 3 PSI subtractive. You need the app to access Race and I believe Bypass and Valet. The only requirement I seen (for Android) is Version 4.0 or better, which shouldn't be an issue. My older Samsung Galaxy S4 Mini has Version 4.4.
Modbargains is so busy right now Marketing answered and will have sales call me back. Before I install it I'm going to make up an extension cable for the boost sensor plugs so I can easily remove it for warranty work.