Exhaust Noise in South Dakota
South Dakota 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 · September 2026
What the law says
South Dakota 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.
Specific Limits
- Statewide decibel limit
- none
Frequently Asked Questions
Are exhaust noise legal in South Dakota?
What are the exact exhaust noise limits in South Dakota?
Street-legal exhaust noise picks
Gear that helps you mod without a ticket in South Dakota.
Measure your exhaust at the test RPM before a fix-it ticket does.
Shop on AmazonA removable insert that brings a loud exhaust back under your state's limit.
Shop on AmazonAs an Amazon Associate, Is My Mod Legal earns from qualifying purchases made through these links, at no extra cost to you. We only recommend gear that helps you stay street-legal.