Modified or Excessively Loud Exhaust
A CVC 27151 citation means your exhaust system was modified in a way that causes the vehicle to be louder than the legal standard. California law sets a maximum noise level for vehicle exhaust. Restoring the exhaust to a compliant system and having it certified resolves this violation.
Correction Window
The deadline is printed on your citation. Restore the exhaust to a compliant system and certify before that date.
Fine After Correction
The base fine is $25 after correction is certified. Without correction, surcharges apply.
Who Can Certify
Any law enforcement officer or licensed muffler shop can certify this correction after the exhaust is restored to a compliant system.
Missing the deadline converts this to a standard infraction. Act before the date on your ticket.
Step by Step
How to Correct This Violation
- 1
Have a licensed muffler or exhaust shop assess the current exhaust system and identify what modifications are non-compliant.
- 2
Replace the non-compliant exhaust components with California-compliant parts.
- 3
Confirm the exhaust noise level meets the legal standard.
- 4
Have a law enforcement officer or licensed muffler shop sign the certificate of correction.
- 5
Submit the signed citation and $25 fee to the court before your deadline.
Questions
Frequently Asked Questions
- What is the maximum exhaust noise level allowed in California?
- California law sets the limit at 95 decibels for most passenger vehicles. This is measured using a specific test procedure. A licensed muffler shop can assess whether your exhaust system meets this standard.
This guide covers passenger vehicle violations. Drivers operating under a commercial license should consult their employer or a licensed attorney.
This guide provides general procedural information only. It is not legal advice. For questions specific to your citation, contact the court listed on your ticket.
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