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The middle one looks most cat 'ish', though it may have a pre cat under the manifold.
I wouldnt cut one out no mate, get a different exhaust if you want it louder, exhausts are made to produce certain back pressure, and cutting a box out will alter it
Yeah no Cat in the pics as there's no lambda's to go with it.
I personally wouldn't cut anything out, exhausts are manufactured to perform. Cut a box out and it may sound better but will have undoubtedly lost power.
Not sure about the twingo but my k4m has a short mani & a gooseneck cat that sits right about where the mystery box does on yours. Have you not considered a different airbox setup?
IMO, butchering your exhaust sounds risky to potentially end up down on power/torque for the sake of how itd sound.