autos let you do a brakestand... so you can build boost before launching, letting you basically to the equivalent of building up RPM and then dumping the clutch but without the associated shock/damage to the drivetrain
but during normal driving you'll likely regret having the auto since the transmission ratios are designed for fuel efficiency instead of driveability (and thus boost management)... i.e. the transmission is designed to keep you at the lowest RPM it can, which means less exhaust to the turbo, which means less boost
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