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I like it. I would like to have it maintain the stock/aftermarket intake hood scoop though.
I think most believe that it has a function, on the R56 it takes air out of the engine compartment ( R56 Challenge had the only open scoop) . We prefer to take air out via the louvres in the correct direction and have lower drag. For the price of a Eventuri you can get hood and our special diffuser :-)
I don`t know how Eventuri solved that vacuum problem, but try it yourself and tape it.