Aftermarket Exhaust Laws by State
Compare aftermarket exhaust regulations across all 50 states.
| State | Status | Key limits | |
|---|---|---|---|
| Alabama | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: not addressed; excessive noise standard applies +1 more on the state page | Details → |
| Alaska | Conditional | Cutouts: prohibited Muffler required: Yes Catalytic converter: removal prohibited by federal law | Details → |
| Arizona | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: not addressed; excessive noise standard applies +1 more on the state page | Details → |
| Arkansas | Conditional | Cutouts: prohibited Muffler required: Yes Catalytic converter: removal prohibited by federal law | Details → |
| California | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: not addressed; excessive noise standard applies +1 more on the state page | Details → |
| Colorado | Conditional | Cutouts: prohibited Muffler required: Yes Catalytic converter: removal prohibited by federal law | Details → |
| Connecticut | Conditional | Cutouts: prohibited Muffler required: Yes Catalytic converter: removal prohibited by federal law | Details → |
| Delaware | Conditional | Cutouts: prohibited Muffler required: Yes Catalytic converter: removal prohibited by federal law | Details → |
| Florida | Conditional | Cutouts: prohibited Muffler required: Yes Catalytic converter: removal prohibited by federal law | Details → |
| Georgia | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: not addressed; excessive noise standard applies +1 more on the state page | Details → |
| Hawaii | Conditional | Cutouts: prohibited Muffler required: Yes Catalytic converter: removal prohibited by federal law | Details → |
| Idaho | Conditional | Cutouts: prohibited Muffler required: Yes Catalytic converter: removal prohibited by federal law | Details → |
| Illinois | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: not addressed; excessive noise standard applies +1 more on the state page | Details → |
| Indiana | Conditional | Cutouts: prohibited Muffler required: Yes Catalytic converter: removal prohibited by federal law | Details → |
| Iowa | Conditional | Cutouts: prohibited Muffler required: Yes Catalytic converter: removal prohibited by federal law | Details → |
| Kansas | Conditional | Cutouts: prohibited Muffler required: Yes Catalytic converter: removal prohibited by federal law | Details → |
| Kentucky | Conditional | Cutouts: prohibited Muffler required: Yes Catalytic converter: removal prohibited by federal law | Details → |
| Louisiana | Conditional | Cutouts: prohibited Muffler required: Yes Catalytic converter: removal prohibited by federal law | Details → |
| Maine | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: not addressed; excessive noise standard applies +1 more on the state page | Details → |
| Maryland | Conditional | Cutouts: prohibited Muffler required: Yes Catalytic converter: removal prohibited by federal law | Details → |
| Massachusetts | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: not addressed; excessive noise standard applies +1 more on the state page | Details → |
| Michigan | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: not addressed; excessive noise standard applies +1 more on the state page | Details → |
| Minnesota | Conditional | Cutouts: prohibited Muffler required: Yes Catalytic converter: removal prohibited by federal law | Details → |
| Mississippi | Conditional | Cutouts: prohibited Muffler required: Yes Catalytic converter: removal prohibited by federal law | Details → |
| Missouri | Conditional | Cutouts: prohibited Muffler required: Yes Catalytic converter: removal prohibited by federal law | Details → |
| Montana | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: not addressed; excessive noise standard applies +1 more on the state page | Details → |
| Nebraska | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: not addressed; excessive noise standard applies +1 more on the state page | Details → |
| Nevada | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: not addressed; excessive noise standard applies +1 more on the state page | Details → |
| New Hampshire | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: not addressed; excessive noise standard applies +1 more on the state page | Details → |
| New Jersey | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: not addressed; excessive noise standard applies +1 more on the state page | Details → |
| New Mexico | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: not addressed; excessive noise standard applies +1 more on the state page | Details → |
| New York | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: prohibited by statute +1 more on the state page | Details → |
| North Carolina | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: prohibited by statute +1 more on the state page | Details → |
| North Dakota | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: not addressed; excessive noise standard applies +1 more on the state page | Details → |
| Ohio | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: not addressed; excessive noise standard applies +1 more on the state page | Details → |
| Oklahoma | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: prohibited by statute +1 more on the state page | Details → |
| Oregon | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: not addressed; excessive noise standard applies +1 more on the state page | Details → |
| Pennsylvania | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: prohibited by statute +1 more on the state page | Details → |
| Rhode Island | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: prohibited by statute +1 more on the state page | Details → |
| South Carolina | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: not addressed; excessive noise standard applies +1 more on the state page | Details → |
| South Dakota | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: not addressed; excessive noise standard applies +1 more on the state page | Details → |
| Tennessee | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: not addressed; excessive noise standard applies +1 more on the state page | Details → |
| Texas | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: not addressed; excessive noise standard applies +1 more on the state page | Details → |
| Utah | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: not addressed; excessive noise standard applies +1 more on the state page | Details → |
| Vermont | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: not addressed; excessive noise standard applies +1 more on the state page | Details → |
| Virginia | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: prohibited by statute +1 more on the state page | Details → |
| Washington | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: prohibited by statute +1 more on the state page | Details → |
| West Virginia | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: prohibited by statute +1 more on the state page | Details → |
| Wisconsin | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: prohibited by statute +1 more on the state page | Details → |
| Wyoming | Conditional | Cutouts: prohibited Muffler required: Yes Louder than stock: not addressed; excessive noise standard applies +1 more on the state page | Details → |
Limits shown apply to sedans, or to all vehicles where the law doesn't distinguish. Vehicle-specific rules, exceptions, and statute citations are on each state's page.
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Every state above links to the full breakdown — exact limits, statute citations, exceptions, and the source law. All free.
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