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On the E60 (500E AMG prepped), the airbox volume was increased to to increase airflow for the 6.0l motor.
The item will directly bolt onto the 500E US version. As for what kind of performance increase you could expect, that I do not know.
I do know that the E50's airbox is a direct bolt on to the E420 and yields a pretty good performance increase. Those air box's can be picked up from German Ebay for under $200
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