2019 California Aftermarket Exhaust
01-15-2019, 05:15 AM
#51
California motorcycle noise limit is a sliding scale and is measured with certified sound meters which the ordinary police car won't be carrying unless specifically targeting vehicle noise. Measured at fifty (50) feet, not right at the tail pipes like cars.
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There may be a 50 foot noise level limit for all vehicles. I don't have enough invested in California to research it.
Noise level decreases rapidly with distance. This graph may help.
-- Chuck
A noise limit of 92 decibels applies to any motorcycle manufactured before 1970.
A noise limit of 88 decibels applies to motorcycles manufactured after 1969 and before 1973; 86 decibels applies to motorcycles manufactured after 1972 and before 1975; 83 decibels applies to motorcycles manufactured after 1974 and before 1986; 80 decibels applies to motorcycles manufactured after 1985.Motorcycles registered in the state that are manufactured on or after 2013 or have an aftermarket exhaust system manufactured on or after 2013 must have the federal EPA noise emission label affixed to it in order to be operated, used, or parked in the state
A noise limit of 88 decibels applies to motorcycles manufactured after 1969 and before 1973; 86 decibels applies to motorcycles manufactured after 1972 and before 1975; 83 decibels applies to motorcycles manufactured after 1974 and before 1986; 80 decibels applies to motorcycles manufactured after 1985.Motorcycles registered in the state that are manufactured on or after 2013 or have an aftermarket exhaust system manufactured on or after 2013 must have the federal EPA noise emission label affixed to it in order to be operated, used, or parked in the state
There may be a 50 foot noise level limit for all vehicles. I don't have enough invested in California to research it.
Noise level decreases rapidly with distance. This graph may help.
-- Chuck
01-28-2019, 01:18 PM
#52
I have been state reffed before so i know what they do. The db meter is only 19 inches away from your exhaust at a 45 degree angle and they rev the s2000 and hold the rpm at a very high level. i dont remember exactly but but it was somewhere in the 5-6,000 rpm range. The stock exhaust comes sort of close to not passing. So no 95 db is not loud. I'm sure most exotic/super cars will not pass this test. and most after markets exhaust will not pass.
01-28-2019, 01:21 PM
#53
I have been state reffed before so i know what they do. The db meter is only 19 inches away from your exhaust at a 45 degree angle and they rev the s2000 and hold the rpm at a very high level. i dont remember exactly but but it was somewhere in the 5-6,000 rpm range. The stock exhaust comes sort of close to not passing. So no 95 db is not loud. I'm sure most exotic/super cars will not pass this test. and most after markets exhaust will not pass.
01-28-2019, 02:19 PM
#54
From what I read, the RPM they rev at depends on the car. I'm thinking that they look at where peak HP is at (maybe through database built off some kind of chart or marketing materials?) and decide the RPM with that.
01-28-2019, 06:21 PM
#55
Would a Shelby 350GT pass as is?
01-29-2019, 12:55 AM
#56
they have a book that will tell them what rpm to do the test in depending on what car you have. But for the s2000 this test is done at a very high rpm. Somewhere in the 5,000 to 6,000rpm range. Like I said I have been state referee before in my Honda S2000.
I imagine that other cars with a much lower rev limit compared to the s2000 are required to do this test at a much lower rpm than the s2000.
01-29-2019, 08:42 AM
#58
the rpm that they hold the rev to is different for every car
they have a book that will tell them what rpm to do the test in depending on what car you have. But for the s2000 this test is done at a very high rpm. Somewhere in the 5,000 to 6,000rpm range. Like I said I have been state referee before in my Honda S2000.
I imagine that other cars with a much lower rev limit compared to the s2000 are required to do this test at a much lower rpm than the s2000.
01-30-2019, 10:06 AM
#59
01-30-2019, 09:07 PM
#60
the law had not changed. It’s just the enforcement of the law had change by there being no more fix it tickets. I’m also 100% positive all cars that have a 100% stock oem exhaust system is legal even if it can’t pass the 95 dB test. And I can guarantee you many exotics like the Non turbo farrari and lambos will not pass the 95 dB test even though they are 100% stock.