The tune works even if you don't have the supercharger attached. People take off their superchargers sometime and can run perfectly fine with it, it just has the capability to read boost and compensate fuel for it (up to 14.7 PSI or something, 2 bar map) as long as you use the same injectors. Obviously tuning is necessary since once you get to or higher than 8-9 PSI you'll require bigger injectors and that will need another tune. But, yeah, smaller pulleys and increased boost is compensated.
I'm clueless about tuning, but this is as far as I know from what I've read and others' experiences.
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