𝐋𝐀𝐍𝐃 𝐓𝐑𝐀𝐍𝐒𝐏𝐎𝐑𝐓𝐀𝐓𝐈𝐎𝐍 𝐎𝐅𝐅𝐈𝐂𝐄 𝐈𝐒𝐒𝐔𝐄𝐒 𝐂𝐋𝐀𝐑𝐈𝐅𝐈𝐂𝐀𝐓𝐈𝐎𝐍 𝐎𝐍 𝐀𝐅𝐓𝐄𝐑𝐌𝐀𝐑𝐊𝐄𝐓 𝐌𝐎𝐓𝐎𝐑𝐂𝐘𝐂𝐋𝐄 𝐌𝐔𝐅𝐅𝐋𝐄𝐑𝐒 𝐀𝐍𝐃 𝐏𝐌𝐕𝐈𝐂 𝐈𝐍𝐒𝐏𝐄𝐂𝐓𝐈𝐎𝐍𝐒  
  
The Land Transportation Office (LTO) today issued this clarificatory statement to address persistent questions and confusion surrounding the use of aftermarket motorcycle mufflers and the role of Private Motor Vehicle Inspection Centers (PMVICs), an issue that continues to generate concern among the riding public.  
  
The LTO emphasizes that while PMVICs conduct mandatory sound level testing as part of the vehicle inspection process, passing the prescribed decibel limit does not constitute legal approval of an aftermarket muffler.  
  
Under LTO Memorandum Circular No. 2020-2240, PMVICs are required to measure exhaust noise levels, with the allowable limit set at 99 decibels. The mandate of PMVICs is limited to determining vehicle roadworthiness and verifying that noise emissions fall within the prescribed threshold. PMVICs do not assess compliance of mufflers with manufacturer specifications or LTO modification regulations. Accordingly, the Motor Vehicle Inspection Report (MVISR) issued after inspection does not certify the legality of any aftermarket component.  
  
A motorcycle that passes the decibel test may still be subject to apprehension if its muffler has been modified or replaced with an unapproved aftermarket version.  
  
Enforcement agencies, including the LTO and the Philippine National Police – Highway Patrol Group (PNP-HPG), are responsible for ensuring compliance with applicable laws and regulations, such as DOTr Department Orders 2010-32 and 2023-008, and Republic Act No. 4136, otherwise known as the Land Transportation and Traffic Code. Motorcycle owners may be required to present valid documentation—such as a Certificate of Road Safety issued by manufacturers or assemblers—demonstrating that any modification or aftermarket replacement conforms with LTO regulations and applicable Philippine National Standards.  
  
The LTO reminds all motorcycle owners that aftermarket parts and accessories must comply with manufacturer specifications and LTO modification policies. Proper documentation should be readily available at all times to avoid inconvenience during roadside inspections.

Offical LTO Announcement regarding aftermarket mufflers