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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sat, Jan-12-2019, 05:50:16 PM   #281
L0ADED
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Default Re: Every CA guy trying to get stock exhaust

Some manufacturers have abused the rules on loud exhaust with their valved systems. If it does not pass at Laguna Seca, it is too loud for the street IMO. It is laughable that the manufacturers think that the owner will only use the loud button option only on track.

Here is a list of some cars that are known to get flagged:

Chevrolet Corvette Z06 (C6, C7), ZR1 (C6)
Porsche 911 GT3 (996, 997, 991.1, 991.2) / GT3 RS
Porsche Cayman S/Boxster S/GTS/GT4 (981, 987)
Dodge Viper
Ford Mustang GT350
Nissan GTR (R34)
Ferrari 458
Ferrari F430
Audi R8
Lamborghini Huracan
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Old Sat, Jan-12-2019, 06:13:03 PM   #282
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Default Re: Every CA guy trying to get stock exhaust

Quote:
Originally Posted by speeeding View Post
95dB on the street is pretty obnoxious. Case in point, Laguna Seca has a 92dB limit, and most of the CA tracks are slowly following suit. Get a decent exhaust, and you can do below 92db all day at full throttle with no problems. I have a Dinan exhaust. The new law isn't for us (most of us) M3 guys. It for the d-bags.


To be fair I donít think the 92 limit as LS is equivalent since itís measured at a different point than this 95.
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Old Sat, Jan-12-2019, 06:27:12 PM   #283
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Default Re: Every CA guy trying to get stock exhaust

Laguna Seca is 93 dB at 50 ft.
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Old Sat, Jan-12-2019, 06:28:46 PM   #284
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Default Re: Every CA guy trying to get stock exhaust

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Originally Posted by speeeding View Post
95dB on the street is pretty obnoxious. Case in point, Laguna Seca has a 92dB limit, and most of the CA tracks are slowly following suit. Get a decent exhaust, and you can do below 92db all day at full throttle with no problems. I have a Dinan exhaust. The new law isn't for us (most of us) M3 guys. It for the d-bags.
What’s the distance for both measurements? You lose ~6db when distance doubles.

Edit: 93dB at 50 ft would be roughly 107dB at 3m

Last edited by terraphantm; Sat, Jan-12-2019 at 06:33:52 PM.
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Old Sat, Jan-12-2019, 08:07:41 PM   #285
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Default Re: Every CA guy trying to get stock exhaust

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Originally Posted by terraphantm View Post
What’s the distance for both measurements? You lose ~6db when distance doubles.

Edit: 93dB at 50 ft would be roughly 107dB at 3m
Exactly. The other difference is at LS, the car is under load, WOT, up hills, at the top of the RPM range. The 3m mandated test is in neutral, from idle to 3k RPM (while the car is already pre-warmed up).
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Old Sat, Jan-12-2019, 10:12:00 PM   #286
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Default Re: Every CA guy trying to get stock exhaust

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Originally Posted by Dr M3an M3 View Post
Exactly. The other difference is at LS, the car is under load, WOT, up hills, at the top of the RPM range. The 3m mandated test is in neutral, from idle to 3k RPM (while the car is already pre-warmed up).
Precisely this point.

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Old Sat, Jan-12-2019, 10:18:55 PM   #287
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Default Re: Every CA guy trying to get stock exhaust

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Originally Posted by Dr M3an M3 View Post
Exactly. The other difference is at LS, the car is under load, WOT, up hills, at the top of the RPM range. The 3m mandated test is in neutral, from idle to 3k RPM (while the car is already pre-warmed up).
Well it's hard to say then. 106db is about 12.5 times louder than 95db. High RPM WOT is louder than a neutral 3k... but is it more than 12.5 times louder?
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Old Sun, Jan-13-2019, 12:27:56 AM   #288
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Default Re: Every CA guy trying to get stock exhaust

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Originally Posted by terraphantm View Post
Well it's hard to say then. 106db is about 12.5 times louder than 95db. High RPM WOT is louder than a neutral 3k... but is it more than 12.5 times louder?
All I was saying was pointing out the other difference. Realistically, our exhausts shouldn't be hitting that dB at 3k RPM unless you're completely open header or straight piped or have cutouts. From idle to 3k, our cars are pretty quiet when not under load...Especially with the usual muffler/exhaust setups most have. 95dB at <3k RPM is LOUD. My point being, aside from the officer's discretion part (which is flawed and abusable) this shouldn't be a huge issue for our car. Brand new 911 GT3s, Lambos, DB9/11's, F-Types, ect. will have much more issues than our cars if an officer wanted to abuse their power (even on an unmodified car).
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Old Sun, Jan-13-2019, 08:23:24 AM   #289
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Default Re: Every CA guy trying to get stock exhaust

The point is, it is possible to go fast without the excessive noise...unless noise is the point.
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Old Sun, Jan-13-2019, 03:35:51 PM   #290
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Default Re: Every CA guy trying to get stock exhaust

so what I get from this is you can't get it certified before you get pulled over and once you get pulled over and had it pass inspection with you spending at least from what I understand around 450bucks then you have proof for the next time you get pulled over that your shit passed already..


then again they can say that "you may have made changes between that time and now" so they can just keep giving you tickets..

I don't really care about it much coz my exhaust is definitely not even close getting to the 90's DB, even at WOT, I actually feel its kinda tame but I guess I'd have to settle for what it has now even if I do have Nevada plates just don't wanna get bothered by getting pulled over because of it lol.
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Discussing Every CA guy trying to get stock exhaust in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)