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3 bar? Seems awfully high to me for NA. I'd submit that if you have a pressure reading of 3 bar in your exhaust piping, and you're running NA, you have something seriously wrong with your exhaust piping.
A turbo causes relatively low velocity high pressure gas to become a high velocity low pressure gas. Since the pressure drops, its temperature drops, too, as all that thermal energy gets converted into kinetic energy. The slight drop in efficiency of the engine is offset by the amount of thermal recovered by the turbine. Isn't that the entire idea? Making more thermal energy available to work? Geez, this sounds too much like making the perfect the enemy of the good.
With that turbosteamie thingy, the exhaust would have to slow down anyway in order to sufficiently heat soak the heat exchanger. That also means higher pressure than for a purely NA application.
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