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Seriously, dude. HowStuffWorks.com. It wasn't a joke response. Search for turbocharging or supercharging. Google. Etc. It's pointless to repeat everything over and over that already exists in soooooooooooo many places. For the "pssh noise," when you let off the throttle, the throttle plate closes. All that pressurized air has to go somewhere, so a blow off valve is used to vent the pressure instead of backfeeding into the turbo and damaging it.
As for tuning, that's a whole entire different story. Learn how the parts work together first.
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