Aftermarket Exhaust in West Virginia
Replacing the exhaust system is legal in West Virginia, but a muffler in good working order is required and cutouts or bypasses are prohibited. Modifications that make the exhaust louder than the originally installed muffler are specifically prohibited.
Verified against primary sources · August 2026
What the law says
Replacing the exhaust system is legal in West Virginia, but a muffler in good working order is required and cutouts or bypasses are prohibited. Modifications that make the exhaust louder than the originally installed muffler are specifically prohibited. Removing the catalytic converter is prohibited by federal law (Clean Air Act § 203) regardless of state rules. The muffler must be original equipment or an equivalent replacement. Annual safety inspection applies; there is no emissions program.
Specific Limits
- Cutouts
- prohibited
- Muffler required
- Yes
- Louder than stock
- prohibited by statute
- Catalytic converter
- removal prohibited by federal law
Exceptions & Exemptions
Must have properly functioning muffler and exhaust system. Noise level cannot exceed reasonable limits. Catalytic converters required on vehicles originally equipped with them.
Frequently Asked Questions
Are aftermarket exhaust legal in West Virginia?
What are the exact aftermarket exhaust limits in West Virginia?
Are there exceptions for aftermarket exhaust in West Virginia?
Street-legal aftermarket exhaust picks
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