The Land Transportation Office (LTO) sets the maximum allowed noise level for motorcycle exhausts at 99 decibels (dB). This limit is measured from 0.5 meters away at a 45-degree angle and at an engine speed of 2,000 to 2,500 rpm. Motorcycles that exceed this limit can fail inspection, face fines, or even risk impoundment. For riders who enjoy the sound of their bikes, remember that the LTO’s 99 dB limit is not a restriction on fun — it’s a guide designed to reduce noise pollution and promote a more peaceful, safer, and more responsible riding environment for everyone.
If you love modifying your motorcycle or using an aftermarket muffler, it’s important to know that the LTO has set strict limits on how loud your exhaust can be. Read on to learn more.
The LTO Muffler Law on Motorcycle Exhaust Sound
As mentioned above, the LTO is quite strict when it comes to the noise emitted by vehicle exhaust. The main rule? Your motorcycle exhaust should not go beyond 99 decibels (dB). This limit is part of the Motor Vehicle Inspection System (MVIS) under LTO Memorandum Circular (MC) No. 2020-2240, and it applies to all motor vehicles, not just to motorcycles.
The LTO MC was also quite clear about how to check for this sound and what the actions are in case the vehicle noise exceeds the set limit. This regulation is supported by the Republic Act No. 4136 (Land Transportation and Traffic Code) and the Clean Air Act of 1999 (RA 8749), both promoting safe, quiet, and environmentally responsible vehicle use.
LTO-Approved Decibel Limit for Motorcycle Exhaust
According to the LTO Memorandum Circular No. 2020-2240 and MVIS inspection standards, motorcycles and all other vehicle must:
- Have a maximum sound level of 99 decibels (dB)
How the Sound Test is Measured
The LTO memo also offers a detailed guide for measuring the motorcycle noise using a sound level meter. The test follows specific guidelines:
- Distance: 0.5 meters away from the exhaust pipe’s tip
- Angle: 45 degrees from the exhaust center line
- Position: Parallel to the ground
- Engine speed: Between 2,000 and 2,500 revolutions per minute (rpm)
- Height: Same level as the exhaust outlet
If your exhaust sound goes beyond 99 dB under these conditions, it means your motorcycle is too loud and may fail the inspection.
What Happens If You Exceed 99 Decibels?
Motorcycles that produce sound levels above 99 dB will fail the MVIS noise test. Here’s what follows:
- You will be given an MVIS Report (MVIR) indicating the needed repairs.
- Your motorcycle will not pass inspection or registration until the issue is fixed.
- You’ll need to repair or replace your muffler (usually reverting to stock or quieter aftermarket exhaust).
- After repair, you must undergo a re-inspection at a Private Motor Vehicle Inspection Center (PMVIC).
- A ₱300 re-inspection fee will be charged.
- Continuous violations may lead to fines or even vehicle impoundment.
Penalties and Enforcement
Here’s a list of the penalties and enforcement guidelines under this law:
- Failing the sound test means your motorcycle can’t be registered or renewed until compliant.
- Apprehensions may also occur during roadside inspections by LTO enforcers using authorized sound meters.
- Violations can result in fines and impoundment, depending on the case.
- Remember: Testing is done after apprehension, not during regular registration.
What You Can Do
Here are a few practical steps to stay compliant and avoid penalties:
- Check your exhaust sound before registration or modification.
- Use stock mufflers or aftermarket ones labeled as LTO-compliant.
- Avoid “open pipe” or racing exhausts in public roads.
- Visit a PMVIC for sound testing if unsure about your setup.
- Stay updated with LTO announcements and local ordinances.