Please look on follow photos and choose the best solution ...

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in my opinion the best solution for wet weather or clear tracs is without filters but for dirt or mud use filters. you wgot bether air flow withou and the sound of sucking air....wsswswswsw, but there is also possibility of suckin some sand or somthing. and i'm sure that you do not want to damage your engine.

Its correct but a lot of people forghet the need 3 cm space for good working .All 124 abarth rally never use a airfilter only grill