An air filtration device of an air suction system of a vehicle engine, comprising: - a suction manifold extending in length along a main axis (X-X) between a first end comprising an outlet mouth fluidically connected to the air suction system, and a second end, for example comprising an inlet mouth ; - at least two tubular filters housed inside said suction manifold , arranged along the main axis (X-X), comprising a first tubular filter positioned proximally to the first end, that is to the outlet mouth , and a second tubular filter positioned proximal to the second end, wherein each tubular filter is traversable by the air from the outside to the inside filtering the air by operating in parallel, respectively comprising centrally a first inner cavity defined by a first inner wall of the first tubular filter and a second inner cavity defined by a second inner wall of the second tubular filter ; - support means supporting the tubular filters in the suction manifold comprising: i) at least one connection element for the connection in series of two consecutive tubular filters; wherein the air filtration device is characterized by the fact that the support means also comprise: ii) a partialization device housed in the first inner cavity to create an obstacle to the flow of air flowing inside said first inner cavity in such a way as to favour the flow of air through the second tubular filter and thus through the second inner cavity . - a suction manifold extending in length along a main axis (X-X) between a first end comprising an outlet mouth fluidically connected to the air suction system, and a second end, for example comprising an inlet mouth ; - at least two tubular filters housed inside said suction manifold , arranged along the main axis (X-X), comprising a first tubular filter positioned proximally to the first end, that is to the outlet mouth , and a second tubular filter positioned proximal to the second end, wherein each tubular filter is traversable by the air from the outside to the inside filtering the air by operating in parallel, respectively comprising centrally a first inner cavity defined by a first inner wall of the first tubular filter and a second inner cavity defined by a second inner wall of the second tubular filter ; - support means supporting the tubular filters in the suction manifold comprising: i) at least one connection element for the connection in series of two consecutive tubular filters; wherein the air filtration device is characterized by the fact that the support means also comprise: ii) a partialization device housed in the first inner cavity to create an obstacle to the flow of air flowing inside said first inner cavity in such a way as to favour the flow of air through the second tubular filter and thus through the second inner cavity . i) at least one connection element for the connection in series of two consecutive tubular filters; wherein the air filtration device is characterized by the fact that the support means also comprise: ii) a partialization device housed in the first inner cavity to create an obstacle to the flow of air flowing inside said first inner cavity in such a way as to favour the flow of air through the second tubular filter and thus through the second inner cavity . <EOS>