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Originally Posted by SkauneJohan
having sometthing like this right in the flow of exhaust does makes a difference
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Sure it may have some downsides, and would work better with an exhaust that had been dimensioned to overcome its eventual side-effects.
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exhaust restricition usually have larger impact on efficiency than intake restriction because of the larger volume, especially the closer the restriction is it is to the exhaust manifold, this is also why getting a free flowing(tuned) exhaust and headers increase power and efficiency 
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Considering that most newer Diesels feature a variable-geometry turbocharger which also provides some sort of engine-braking under some circumstances, I wouldn't hold my breath for an exhaust-brake to have a worse effect than a throttle plate. But anyway, if I were going to buy a non-VGT Diesel right now I would still consider adding an exhaust-brake because my hometown and most other cities where I usually go are quite hilly.