For a lot of fleet owners, it's personal preference to reduce the exhaust noise on your truck. But the US EPA also has regulations for maximum noise levels, and although vehicle manufacturers are responsible for compliance of new trucks, owners are responsible for in–use trucks. Are you in compliance?
- New trucks must be no louder than 80dB at 50 feet.
- In–use trucks manufactured in 1986 or later must be less than 83dB.
- In-use trucks manufactured before 1986 must be no louder than 86dB.
- A replacement muffler be no louder than the original equipment (first–fit) muffler.
We've put together a list of some basic practices to help reduce exhaust system noise. Keep reading to see which ones you can implement.
- Tail pipes on horizontal exhaust systems should be tipped toward the center of the vehicle to avoid noise reflection off the road
- If you hear a "rap" at certain engine speeds, try a stack with a different length.
- A resonator can be used in-line with the recommended muffler for additional noise reduction.
- Check the flex tube regularly and repair worn or leaking tubing.
- Make sure the exhaust system is properly supported with required brackets, clamps and braces.
- Check strap seal band clamps to ensure properly tightened to avoid leaks.
- Consider acoustic compound when repairing OD–ID connections.
- If you have curved stacks, replace them with straight stacks, so that the noise is thrown up instead of to the side.
If you find your exhaust system could use a little help, shop our line of Nelson Global exhaust and muffler products.
