Aftermarket Exhaust in Tennessee
Replacing the exhaust system is legal in Tennessee, but a muffler in good working order is required and cutouts or bypasses are prohibited. There is no statutory 'no louder than stock' rule — the standard is that the exhaust must not produce excessive or unusual noise.
Verified against primary sources · August 2026
What the law says
Replacing the exhaust system is legal in Tennessee, but a muffler in good working order is required and cutouts or bypasses are prohibited. There is no statutory 'no louder than stock' rule — the standard is that the exhaust must not produce excessive or unusual noise. Removing the catalytic converter is prohibited by federal law (Clean Air Act § 203) regardless of state rules. Tennessee is one of the few states with a statutory number: 'excessive or unusual noise' is defined to include exhaust above 95 dB, and an SAE-standard measurement is an affirmative defense. A violation is a Class C misdemeanor. Tennessee has had no safety or emissions inspection since 2022.
Specific Limits
- Cutouts
- prohibited
- Muffler required
- Yes
- Louder than stock
- not addressed; excessive noise standard applies
- Catalytic converter
- removal prohibited by federal law
Frequently Asked Questions
Are aftermarket exhaust legal in Tennessee?
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Street-legal aftermarket exhaust picks
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