The Sound Test
As defined by state and federal law, vehicle sound is to be measured by a decibel meter 20 inches and 45 degrees from the exhaust outlet. ATVs and motorcycles are tested at 50% of the manufacturer's RPM recommendation. Class II vehicles are tested at 75% of the engine's maximum RPM.
What Works
Stock is always best! We recommend that you operate with your vehicle's stock pipe and muffler, and maintain it in good working condition. Regardless of what you purchase for your ATV, you are still responsible for ensuring that it meets the requirements of the law.
Not all mufflers will work the same on all OHV's. Since results vary with modifications, along with vehicle care and maintenance, we cannot guarantee that these mufflers will work on your particular ATV. Oregon Dunes National Recreation Area Sound Limit: 93 dB Sand Lake Sound Limit: 97 dB
If you have an aftermarket pipe, you probably exceed these limits and risk a hefty ticket.
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