Substantially reduced road and wind noise

Many improvements were made to structural rigidity and powertrain NVH performance to provide a quieter, more pleasant ride, including the reduction of high frequency booming noise sometimes heard when decelerating while further evolving a sporty engine note. Increasing the rigidity of components and joints also helped to deliver a quieter ride that rates among the class leaders. The sound pressure level of road noise was curtailed by 6 to 11 percent over the previous model, and wind noise was reduced by approximately 6 percent, to 59.0 dB at 100 km/h with a 5 m/s crosswind, placing the all-new Mazda 3 among the quietest in the class.

    See also:

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    Registering Your Vehicle in A Foreign Country (Except United States and Canada)
    Government regulations in your country could require that automobiles meet specific emission and safety standards. Vehicles built for your country may differ from those built for other countries. ...