FIFTEENTH CONGRESS OF THE REPUBLIC 
) 
OF THE PHILIPPINES 
) 
First Regular Session 
) 
SENATE 
S.No. 1690 
Introduced by Senator Miriam Defensor Santiago 
EXPLANATORY NOTE 
The noise level in our cities is rapidly increasing. This is due to heavier traffic and more 
powerful engines. On top of that there is a growing number of vehicles which are much louder 
due to the fact that their owners install or modify mufflers which can be heard from a kilometer 
away. 
The noise produced by these vehicles not only lowers the quality of life and work of the 
majority of people but also can result in permanent hearing loss for vehicle operators and people 
nearby (this includes unborn children, since noise penetrates the womb). At high levels this noise 
can result even in tissue damage (body parts and organs resonate and tissues can fracture at some 
low frequencies) leading to serious health problems. 
Vehicles with modified mufflers are highly distracting in traffic and can cause accidents 
since they mask sounds and agitate drivers. Loud sounds can affect hearing, vision, reaction time 
and judgment of drivers and nearby people incr~asing dangers significantly for everyone 
involved. 
This Bill seeks to regulate the modification of mufflers to increase noise emitted from a 
vehicles exhaust system in order to prevent excessive or unusual noise and annoying smoke. 1 
1 This bill was originally filed in the Fourteenth Congress, Second Regular Session 
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FIFTEENTH CONGRESS OF THE REPUBLIC 
) 
OF THE PHILIPPINES 
) 
First Regular Session 
) 
Introduced by Senator Miriam Defensor Santiago 
) 
1 
AN ACT 
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PROHIBITING MODIFICATION OF MUFFLERS TO INCREASE NOISE EMITTED FROM 
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EXHAUST SYSTEMS. 
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Be it enacted by the Senate and the House of Representatives of the Philippines in 
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Congress assembled: 
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SECTION 1. Short Title. - This Act may be known as the "Anti-mujJler Modification 
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Act". 
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SECTION 2. Muffler Conditions. - Every motor vehicle shall at all times be equipped 
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with a muffler in good working order, and in constant operation to prevent excessive or unusual 
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noise and annoying smoke. 
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The engine and power mechanism of every motor vehicle shall must be so equipped and 
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adjusted as to prevent the escape of excessive fumes or smoke. 
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SECTION 3. Prohibitions - A person may not operate a motor vehicle with an exhaust 
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system that emits a noise in excess of 95 decibels, or modify the exhaust system of a motor 
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vehicle in a manner that will amplify or increase the noise emitted by the engine of the motor 
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vehicle in excess of the noise emitted by the muffler installed on the motor vehicle in the 
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manufacturer's original design. 
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SECTION. 4. Penalties. - Any person who shall violate the provisions of this Act shall 
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upon conviction, be subject to a fine of not less than Ten thousand pesos (PIO,OOO.OO) but not 
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more than Fifty thousand pesos (P50,000.OO) or imprisomnent of not less than two (2) months 
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but not more than one (1) year, or both upon the discretion ofthe court. 
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SECTION 5. Separability Clause. - If any provision or part thereof, is held invalid or 
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unconstitutional, the remainder of the law or the provision not otherwise affected shall remain 
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valid and subsisting. 
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SECTION 6. Repealing Clause. - Any law, presidential decree or issuance, executive 
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order, letter of instruction, administrative order, rule or regulation contrary to, or inconsistent 
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with the provisions of this Act is hereby repealed, modified or amended accordingly. 
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SECTION 7. Effectivity Clause. - This Act shall take effect fifteen (15) days after its 
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publication in at least two (2) newspapers of general circulation. 
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Approved. 
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