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I guess that some form of afterburner could be installed between the valves and turbo, to add heat energy to the exhaust, during lower RPM. But I believe that just by resizing the turbo, both the intake and exhaust impellers, could result in a turbo that pumps out a lot of air at lower RPM. Yes, it would be less efficient at higher RPM because of so much wasted blow-by, but it would really reduce turbo lag.