Noise Control Act Article 11

Sounds generated by motor vehicles and civil aircraft may not exceed motor vehicle and civil aircraft noise control standards. The central competent authority in conjunction with the Ministry of Transportation and Communications shall determine relevant standards.Motor vehicles for domestic use shall meet the noise control standards in the foregoing paragraph before they may be imported, manufactured or used.The central competent authority in conjunction with the Ministry of Transportation and Communications shall determine regulations governing noise control items, procedures, and restrictions for in-use motor vehicles and civil aircraft, the qualifications of testing personnel, and other binding matters.
中文原文 噪音管制法第11條
機動車輛、民用航空器所發出之聲音,不得超過機動車輛、民用航空器噪音管制標準;其標準,由中央主管機關會同交通部定之。
機動車輛供國內使用者,應符合前項噪音管制標準,始得進口、製造及使用。
使用中機動車輛、民用航空器噪音管制項目、程序、限制、檢驗人員之資格及其他應遵行事項之辦法,由中央主管機關會同交通部定之。

English translation for reference only; the Chinese text prevails. Not legal advice.