Exhaust Noise in Hawaii
Hawaii sets no statewide decibel limit for passenger cars. A muffler in good working order is required, exhaust may not produce excessive or unusual noise, and cutouts or bypasses are prohibited.
Verified against primary sources · August 2026
What the law says
Hawaii law is qualitative rather than numeric: A muffler in good working order is required, exhaust may not produce excessive or unusual noise, and cutouts or bypasses are prohibited. Hawaii's test is comparative: no muffler, cutout, or bypass that noticeably increases noise above the factory level, with fines from $25 to $250. Note that § 291-24 covers motorcycles and mopeds only, and Hawaii's old vehicular-noise rule chapter has been repealed, so no numeric limit applies.
Specific Limits
- Statewide decibel limit
- none
Frequently Asked Questions
Are exhaust noise legal in Hawaii?
What are the exact exhaust noise limits in Hawaii?
Street-legal exhaust noise picks
Gear that helps you mod without a ticket in Hawaii.
Measure your exhaust at the test RPM before a fix-it ticket does.
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