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In a lot of places a turbo is considered a muffler or sound damping device which allows for exhausts to be straight piped after the turbo legally.
Did this with my WRX. Kept the cats but everything behind them was pretty much just a tube with nice looking tips at the end
For a short time I worked in a factory that made school busses. They used big diesel engines and not a single one of them had a muffler. The SCR and the turbo made them plenty quiet.