Exhaust db measurements - Hyundai Genesis Forum
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post #1 of 16 Old 04-13-2019 Thread Starter
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Exhaust db measurements

Just purchased my 2014 3.8 rspec. Im in the market for a new exhaust but (unfortunately) live in California. Are there any CBE out there that would put me under or close to that 95 db law? Im currently looking into the CNT V3
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post #2 of 16 Old 04-13-2019
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Originally Posted by rsnikulin View Post
Just purchased my 2014 3.8 rspec. Im in the market for a new exhaust but (unfortunately) live in California. Are there any CBE out there that would put me under or close to that 95 db law? Im currently looking into the CNT V3
Just buy a decibelmeter and ask the FB group if you can measure their cars. I bought one on Amazon for I think 60 bucks. Same one the Laguna Beach PD, Pasadena PD, and CHP use.

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Originally Posted by rsnikulin View Post
Just purchased my 2014 3.8 rspec. Im in the market for a new exhaust but (unfortunately) live in California. Are there any CBE out there that would put me under or close to that 95 db law? Im currently looking into the CNT V3
Just buy a decibelmeter and ask the FB group if you can measure their cars. I bought one on Amazon for I think 60 bucks. Same one the Laguna Beach PD, Pasadena PD, and CHP use.
I wanted to know the noise level of other peoples exhaust prior to me purchasing my own. It would be a bummer to buy an expensive exhaust then be fined and have to take it off.
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I wanted to know the noise level of other peoples exhaust prior to me purchasing my own. It would be a bummer to buy an expensive exhaust then be fined and have to take it off.
Yeah, that's what I'm trying to help you do, Signore. It's apparent you didn't actually read my reply so we'll try again...

The exhaust manufacturers don't provide noise level certifications for their products. It's not data you can look up on a chart somewhere. Additionally, very few owners with off-the-shelf exhausts have a decibelmeter, so nobody can tell you in scientific metrics how loud their exhausts are in combination with their particular mods and tunes. You'll need to provide the tool(a $60 decibel meter), and then ask the community what they have on their cars, then ask them if you can go measure the loudness according to the SAE stated procedure that CHP uses to determine compliance. Otherwise you're just going to have to hope whatever you buy passes muster. Added bonus: you get to go out, meet the group at large, maybe make some new friends.

For the record, a 2018 Fiat 500 Abarth factory stock is above the limit. Same for a V6 Jag F-type. The cars sound great, but honestly aren't very loud. There is a very fine line here and you might be wasting your time trying to find the holy trinity of added performance + good sound + legal compliance. Cheers, and luck in battle!
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post #5 of 16 Old 04-14-2019
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I have a 14 3.8 with a Borla catback, sorry i dont have a db meter to provide exact numbers but I will say its very quiet for a aftermarket C.B.E. not much louder than stock, if at all, at least to my ears. If CA is cracking down that hard, you might be better off just staying stock and/or adding electric cut outs.
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You can get DB meter apps for cell phones.
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Get yourself a nice catback exhaust you want, if you get pulled over and go over the db limit.... play dumb and blame it on the exhaust shop.

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I just went for it and ordered a cnt v3 polished silver tips. It seems like one of the quieter and deeper exhausts on the market time to cross my fingures and hope that the police wont give me too much trouble
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CARB and most auto cali laws are stupid.
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CARB and most auto cali laws are stupid.
PREACH, Frontiersman!

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post #11 of 16 Old 04-16-2019
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PREACH, Frontiersman!
Time for people to offroad convert their cars and re-register them as "trucks" to get around their stupid regulations.
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Time for people to offroad convert their cars and re-register them as "trucks" to get around their stupid regulations.
Ahh, so you don't know how deeply the stupid rules run, then?

1: No vehicle can change class from it's manufacturer's assigned vin unless rebuilt to the stipulation of "Specially constructed vehicle" as delineated in the CVC (CA vehicle code) and inspected by BAR and assigned a new VIN by the state.

2: Our large trucks(including industrial diesels built before 1995) are subject to smog regs and inspection.

3: The CA Db limits for vehicles over 6000lbs and for motorcycles is LOWER than the noise limits for passenger cars.

Ain't that all a peach? The only solution available is to register the vehicle out of state, which can be done legally,... and can be done shadily. There was a Nevada registered Mustang next to me in Corona Del Mar, yesterday. Loud as the roaring hoardes of Hades: snarling, popping, raucous! The Cops ignored him on PCH in a tourist spot. There is power in out-of-state reg.

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post #13 of 16 Old 04-16-2019
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Ahh, so you don't know how deeply the stupid rules run, then?

1: No vehicle can change class from it's manufacturer's assigned vin unless rebuilt to the stipulation of "Specially constructed vehicle" as delineated in the CVC (CA vehicle code) and inspected by BAR and assigned a new VIN by the state.

2: Our large trucks(including industrial diesels built before 1995) are subject to smog regs and inspection.

3: The CA Db limits for vehicles over 6000lbs and for motorcycles is LOWER than the noise limits for passenger cars.

Ain't that all a peach? The only solution available is to register the vehicle out of state, which can be done legally,... and can be done shadily. There was a Nevada registered Mustang next to me in Corona Del Mar, yesterday. Loud as the roaring hoardes of Hades: snarling, popping, raucous! The Cops ignored him on PCH in a tourist spot. There is power in out-of-state reg.
If you fabricate half the car from scratch and change the power plant. You "could" register it as a kit car (grey market, not import grey market) then it would be pretty much to the inspector's discretion whether it can be registered this way, and what regs would be applied to it. Most datsun RB owners, knows this path well.
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If you fabricate half the car from scratch and change the power plant. You "could" register it as a kit car (grey market, not import grey market) then it would be pretty much to the inspector's discretion whether it can be registered this way, and what regs would be applied to it. Most datsun RB owners, knows this path well.
Yeah, that totally falls under the specialy constructed vehicle clause, but they only give out 500 exemptions for that path per year. And anything "Datsun" would probably be a non-issue as it mostly predates the 1975 enforcement drop off. It really does suck, man.

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Yeah, that totally falls under the specialy constructed vehicle clause, but they only give out 500 exemptions for that path per year. And anything "Datsun" would probably be a non-issue as it mostly predates the 1975 enforcement drop off. It really does suck, man.
Actually all smog related inspection would fall under which engine you use. So if your new engine came with cats then it would still have to have cats.

datsuns were still badged datsuns up to 82 IIRC then switch to nissan

Alaska was under most of these regs up until IIRC 2009. They were trying to do away with it since 2000, because the air quality is cleaner than the 1980.
They kept it until then because they had all this smog equipment that would just sit if they did away with it. My assumption is the cost of inspection and maintenance or replacement of said equipment because greater than the income generated from IM inspections

Last edited by AKGC; 04-16-2019 at 11:23 AM.
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Yeah, that totally falls under the specialy constructed vehicle clause, but they only give out 500 exemptions for that path per year. And anything "Datsun" would probably be a non-issue as it mostly predates the 1975 enforcement drop off. It really does suck, man.
Actually all smog related inspection would fall under which engine you use. So if your new engine came with cats then it would still have to have cats.

datsuns were still badged datsuns up to 82 IIRC then switch to nissan

Alaska was under most of these regs up until IIRC 2009. They were trying to do away with it since 2000, because the air quality is cleaner than the 1980.
They kept it until then because they had all this smog equipment that would just sit if they did away with it. My assumption is the cost of inspection and maintenance or replacement of said equipment because greater than the income generated from IM inspections
No, the 500 specialty exemptions have zero smog requirements. You can even put a marine, ag, or airframe rated engine in them. Whatever you want. Kit Cars, specifically, yeah, they get registered, with associated smog requirements, as whatever year and engine/computer type the donor came with. Pretty ridiculous, honestly.

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