Single Turbo Blow through Small Block Kits???

Not that I'm anti turbo, but.........

How much power does it take away from the engine to spin that turbo?

IF the turbo has to pressurize the engine, the impeller has to have some force put on it in order to spin it to make pressure. Once the engine is under prssure, there has to be more force required to spin the turbo in order to maintain pressure.

This is back pressure on the engines exhaust side. This has to cost power in some way shape or form.