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I'm not terribly familiar with offerings in SA, but in other parts of the world, superchargers are popular for really two reasons, simplicity of installation, and under hood temps are lower. In the US we have a LOT of track junkies, and the turbo guys have a harder time managing heat, melting radiator fans, etc.
TCs are great for overall power, higher power potential, and on the fly boost adjustability, but their drawback is heat and complexity.
SCs are great for simplicity, instant responsiveness, and a little less weight than a turbo. There is also no lag or boost threshold because boost is always there, so the engine feels more linear/predictable at partial throttle and on/off throttle. SC drawback is mainly less adjustability on the fly.
Twin screw style SCs squish air into the engine by physical compression, they offer the biggest gains at low/mid RPM. Centrifugal SCs use an impeller like a turbo, so they're very efficient, but the power curve rises linearly with RPM so they are most effective at high RPM.
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