Owners of vehicles with particularly loud exhausts may want to check that soon. Aside from the five-year tire rule the Land Transportation Office (LTO) will impose on the new Motor Vehicle Inspection System (MVIS), the gov't agency will also be testing how loud a car's exhaust is.

Under section 5.4.3.7, a Motor Vehicle Inspection Center (MVIC) will use a 'sound level meter' to check how much sound pressure a car is making. The MVIC will place the sound level meter in four different positions.

A. At a 45-degree angle to the exhaust centerline

B. Parallel to the ground

C. 0.5 meters to the rear of the exhaust outlet

D. At the same height as the exhaust outlet

LTO: Vehicles with exhausts exceeding 99 decibels to fail MVIS image

The new rule states the sound level of the exhaust or muffler must not exceed 99 decibels (dB). The test is conducted at engine speeds between 2,000 to 2,500 rpm. Failure to pass this test will result in the MVIC confiscating a vehicle's front plate. The vehicle owner will receive an MVISR (Motor Vehicle Inspection System Report) after the test.

Once a vehicle comes back and passes the test, the MVIC can return the front plate. After that, the motor vehicle's registration can be renewed.

While this measure will help weed out those that put excessively loud exhausts on their cars, we're curious if there will be an issue with stock vehicles that come with loud pipes as standard. There's also the matter of cars that come with an exhaust valve on their system. When activated, this can make a vehicle's muffler louder or quieter, depending on the setting.

Could the LTO make adjustments to this ruling in the future? What will their approach be should a completely unmodified car make more than 99 dB?

We're still going over the 33-page list of guidelines, but it will also be interesting to see how the MVICs will test the sound levels of jeepneys (along with motorcycles) that come with loud mufflers.