Aftermarket Exhaust in California
Vehicle type: Sedan
Replacing the exhaust system is legal in California, 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
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Frequently Asked Questions
Are aftermarket exhaust legal in California?
What are the aftermarket exhaust limits in California?
Are there exceptions for aftermarket exhaust in California?
Street-legal aftermarket exhaust picks
Gear that helps you mod without a ticket in California.
Cat-back systems keep your emissions equipment intact — the compliance-friendly route.
Decibel meter →Measure your exhaust at the test RPM before a fix-it ticket does.
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