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Today's turbos are smaller with less inertia, and the intake and exhaust valves are specially configured to bring the turbos up to speed quite fast and at a low RPM. If you look at the torque curve, it builds at a fairly low RPM, and is much flatter than turbos of old that took awhile to come up to speed, then kicked you in the butt. This makes handling and efficiency better since things are smoother.
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