Tim-That CX Guy
Resident Window Licker
This is phenomenal information for bikes and cars alike, it deserves a sticky.
When I was dealing with my exhaust ticket a few years back, I looked into this option and remember reading somewhere in the CVC that whether an exhaust is in violation is up to the officer's discretion and up to the operator to prove the officer wrong, regardless of certificates and sound tests. Although, I can't seem to find that wording in the CVC anymore.Looks like we found a solution.
After you pass the sound test I suppose you can carry a copy of the test results in the car to present to the officer if you get stopped for this again.
PITA for sure but if you pass the referee sound test you should be golden.
After you pass the sound test I suppose you can carry a copy of the test results in the car to present to the officer if you get stopped for this again.
1)
CA does not have a 95dB limit per say. What it does have is a 95db limit for manufacturers of new vehicles, which is defined by the SAE standard quoted elsewhere - which the SAE no longer considers appropriate as it requires testing under operating conditions which are not permitted by many modern...
So I am going to get my car tested at a referee station and then present the evidence in a trial by written declaration.![]()
any excessive or unusual noise

I've just been shaking my head as I read all the post here; especially since if you had used the search you would find many threads on this already. There is no need for a decibel meter and it can still be illegal if it’s under the db limit. Those whistle tips that were out for a while were probably under the db level, but still illegal.
Adequate Muffler Required
27150. (a) Every motor vehicle subject to registration shall at all times be equipped with an adequate muffler in constant operation and properly maintained to prevent any excessive or unusual noise, and no muffler or exhaust system shall be equipped with a cutout, bypass, or similar device.
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I've just been shaking my head as I read all the post here; especially since if you had used the search you would find many threads on this already. There is no need for a decibel meter and it can still be illegal if it’s under the db limit. Those whistle tips that were out for a while were probably under the db level, but still illegal.
Adequate Muffler Required
27150. (a) Every motor vehicle subject to registration shall at all times be equipped with an adequate muffler in constant operation and properly maintained to prevent any excessive or unusual noise, and no muffler or exhaust system shall be equipped with a cutout, bypass, or similar device.
(b) Except as provided in Division 16.5 (commencing with Section 38000) with respect to off-highway motor vehicles subject to identification, every passenger vehicle operated off the highways shall at all times be equipped with an adequate muffler in constant operation and properly maintained so as to meet the requirements of Article 2.5 (commencing with Section 27200), and no muffler or exhaust system shall be equipped with a cutout, bypass, or similar device.
(c) The provisions of subdivision (b) shall not be applicable to passenger vehicles being operated off the highways in an organized racing or competitive event conducted under the auspices of a recognized sanctioning body or by permit issued by the local governmental authority having jurisdiction.
Amended Ch. 558, Stats. 1977. Effective January 1, 1978. Supersedes Ch. 579.
My counsin got one of these on his evo (under my name), and a SFPD officer told me that even when you get it signed off it is a point on your record. Is this true? I'm just worried because I am currently in one of the eligibilty lists for sfpd and fremont pd.
Thanks