For what it's worth, I've heard people complain that Stromung dual-tip exhausts are too loud when combined with a header and non-resonated midpipe, but I'm perfectly comfortable with mine. Haven't had a complaint from my wife, either, and never felt like I ought to add a resonator. Keep in mind that I'm normally aspirated, though.
My point is that a lot of this is purely subjective. . . I'd say if you can get it done for cheap, give it a shot.
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