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Laguna Seca Exhaust 92db max #2026463
03/07/16 02:10 PM
03/07/16 02:10 PM
Joined: Jun 2007
Posts: 2,432
NorCal
RylisPro Offline OP
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RylisPro  Offline OP
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NorCal
I was going to work this morning and a police officer was waiting for me and pulled me over. He said that one of the neighbors had called in a noise complaint on my car because of the noise. I have a 3 inch X-pipe setup with Magnaflow mufflers that dump out before the axle so it is quite loud, but it's not like I rev my engine to piss off the neighbors as I am very respectful of them as well and my neighborhood is right next to a train track haha! The officer was cool and let me go but said if my neighbors complain again I will get cited.

I plan on building a super quiet exhaust which is cool because now I will be able to drive at Laguna Seca with their stupid 92 decibels or less rule.

Will be using 2.25 or 2.5 inch piping to keep it all light, what mufflers would you guys use?

Thanks!


73 `Cuda
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Re: Laguna Seca Exhaust 92db max [Re: RylisPro] #2026501
03/07/16 03:07 PM
03/07/16 03:07 PM
Joined: Oct 2013
Posts: 380
Escondido CA USA
Tomswheels Offline
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Escondido CA USA
I used a 2.5 with cheaply turbo mufflers, never had a problem with the 93DB rule down in San Diego.

Re: Laguna Seca Exhaust 92db max [Re: RylisPro] #2026628
03/07/16 05:52 PM
03/07/16 05:52 PM
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Bitopia
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jcc Offline
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jcc  Offline
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Isn't dumping before the axle the first real problem?
Maybe using what you got, and simply stepping it down to 2.25 over axle and out the back tailpipe, may do the trick, be a lot easier then starting over. twocents


Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
Re: Laguna Seca Exhaust 92db max [Re: RylisPro] #2026629
03/07/16 05:54 PM
03/07/16 05:54 PM
Joined: Feb 2010
Posts: 270
Mountain View, CA
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68rrunner Offline
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68rrunner  Offline
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Mountain View, CA
Dynomax resonators and Super Turbo Mufflers. Nice and quiet.
I had the same thing happen to me. Neighbors bitched about my old system with flowmasters, so that was the compromise. Still didn't pass the California dB requirements, but judge deemed my efforts were in the "spirit" of the law.

Re: Laguna Seca Exhaust 92db max [Re: 68rrunner] #2026772
03/07/16 09:26 PM
03/07/16 09:26 PM
Joined: Oct 2010
Posts: 463
Rescue CA.
joes68340s Offline
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Tail pipes stepped down will make all the difference. And if it still to loud you can add some small dynomax strait through mufflers as resonators.

Re: Laguna Seca Exhaust 92db max [Re: RylisPro] #2026822
03/07/16 10:44 PM
03/07/16 10:44 PM
Joined: Oct 2015
Posts: 107
so cal
alltime Offline
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so cal
When I run my cuda at Laguna I run 2.5" Flow Masters with turn downs in front of the rear axles. When I pass the sound booth at turn 6 I have never been black flaged for being over 92db the 4 races Ive run there.

The cop cant ticket you just because they complain again. Tell him that you have been nice an leaving the Harley at home...LOL.

The inexpensive 2.5 " Turbo mufflers are basically the same sound and at levels similar to OEM Hemi mufflers from 1970, which is way quieter than 92 Db.

Sounds like you may have to start knocking on neighbors doors at 3am and apologizing for your car, Just to let them know you are conscientious of course.

Alltime

Last edited by alltime; 03/08/16 02:56 AM.
Re: Laguna Seca Exhaust 92db max [Re: RylisPro] #2027246
03/08/16 03:30 PM
03/08/16 03:30 PM
Joined: Nov 2008
Posts: 1,490
Lethbridge, AB, Canada
dangina Offline
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i run 2.5" x-pipe tti exhaust with dynomax super turbo mufflers and dougs exhaust cuttouts so i can open them up when I want wink

Re: Laguna Seca Exhaust 92db max [Re: dangina] #2027337
03/08/16 06:21 PM
03/08/16 06:21 PM
Joined: Jan 2010
Posts: 1,440
NW Chicago suburban area
Mopar Mitch Offline
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Mopar Mitch  Offline
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NW Chicago suburban area
I run 2.5" tubes, flowmasters, dumped in front of the axles.... great sound, less weight... local authorities have pulled me over just asking if the car is for sale!


Mopar Mitch "Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers! Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!
Re: Laguna Seca Exhaust 92db max [Re: RylisPro] #2027489
03/08/16 09:43 PM
03/08/16 09:43 PM
Joined: Jul 2006
Posts: 106
Waterloo Iowa
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80mirada Offline
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Waterloo Iowa
i would find out what the local ordinances are. One of my friends got a ticket in a small town one night, but the only noise ordinance for the town was "No spurring your horse in front of the tavern on Sunday morning".

Last edited by 80mirada; 03/08/16 09:44 PM.
Re: Laguna Seca Exhaust 92db max [Re: 80mirada] #2027493
03/08/16 09:47 PM
03/08/16 09:47 PM
Joined: Dec 2003
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Bitopia
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jcc Offline
If you can't dazzle em with diamonds..
jcc  Offline
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But that wasn't my horse.


Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
Re: Laguna Seca Exhaust 92db max [Re: RylisPro] #2028312
03/10/16 02:23 AM
03/10/16 02:23 AM
Joined: Aug 2004
Posts: 3,310
Walnut Creek, CA
blown340 Offline
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Walnut Creek, CA
I run the full tti 3" exhaust with their headers on my challenger. It's quite loud when I'm on it, but when I'm trying to be respectful it isn't bad at all. Mine runs all the way out the back to tips.

I think getting rid of the dump before the axle and installing tailpipes will probably make a big enough difference to keep you out of trouble. twocents

-Jon


70 challenger convertible. 340/5 speed. blown, intercooled, efi, blah blah blah 71 valiant scamp 318/A833OD/AC/PS 00 dakota RC 4.7L 5 spd autoX'r. SRT10/T56 swap in process 73 W200 Power wagon, PTO winch, 4 spd
Re: Laguna Seca Exhaust 92db max [Re: RylisPro] #2028627
03/10/16 04:42 PM
03/10/16 04:42 PM
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Posts: 43
Santa Fe Springs, CA
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Jon @ Hotchkis Offline
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Santa Fe Springs, CA
Grab a set of 2.5" tail pipes that run as far back as possible. If those alone aren't enough you can chop out the rear section between the axle and bumper and put the longest set of glasspacks you can fit:



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Re: Laguna Seca Exhaust 92db max [Re: Jon @ Hotchkis] #2029151
03/11/16 12:59 PM
03/11/16 12:59 PM
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Pikes Peak Country
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TC@HP2 Offline
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Pikes Peak Country
Originally Posted By Jon @ Hotchkis
Grab a set of 2.5" tail pipes that run as far back as possible. If those alone aren't enough you can chop out the rear section between the axle and bumper and put the longest set of glasspacks you can fit:


I've done this on a vehicle before and it really took the raspy bite and highway drone out of the system

Re: Laguna Seca Exhaust 92db max [Re: RylisPro] #2029205
03/11/16 02:41 PM
03/11/16 02:41 PM
Joined: Aug 2013
Posts: 106
Central IL
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Trojmn Offline
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Central IL
Is that an optical illusion or is the exhaust running under the rear axle?

the car is on a 2 post so the suspension is full droop. From the angle of the pic it certainly looks like you could run the exhaust underneath.

Re: Laguna Seca Exhaust 92db max [Re: RylisPro] #2029207
03/11/16 02:45 PM
03/11/16 02:45 PM
Joined: Jun 2007
Posts: 2,432
NorCal
RylisPro Offline OP
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RylisPro  Offline OP
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NorCal
I thought long and hard about a proper solution and decided that my neighbors can go pound sand.
It took me a long time to build my car they way it is and I think its perfect no changes needed haha!

I'm just going to get a daily driver beater so I don't wake people up in the morning. I called the police dept. They were cool and they said I will only get ticketed if I get caught in the act.
I will only drive my car random times so no worries there!


73 `Cuda
Instagram: @rylispro
YouTube: RylisPro
www.rylispro.com
925-214-9192
Re: Laguna Seca Exhaust 92db max [Re: RylisPro] #2029271
03/11/16 04:22 PM
03/11/16 04:22 PM
Joined: Dec 2003
Posts: 22,695
Bitopia
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jcc Offline
If you can't dazzle em with diamonds..
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Posts: 22,695
Bitopia
Just make sure your exhaust issue is not a gateway to other possible violations.

This post makes me wonder if a muffler needs some exit back pressure to be most effective in quieting the exhaust. Additionally, if one wanted the loudest exhaust possible, exiting underneath the car midway, likely provides the best acoustic coupling, ie loudest, kinda like how some small consumer home sub woofers are designed, with woofers facing the floor. twocents


Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
Re: Laguna Seca Exhaust 92db max [Re: RylisPro] #2029284
03/11/16 04:43 PM
03/11/16 04:43 PM
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Nebraska
72Swinger Offline
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Nebraska
Ive put 2.5" turndowns on 3" mufflers and it quieted it down some. A longer bodied muffler helps also, a 14" body will be quite a bit louder than an 18" bodied muffler.


Mopar to the bone!!!
Re: Laguna Seca Exhaust 92db max [Re: RylisPro] #2029593
03/12/16 01:45 AM
03/12/16 01:45 AM
Joined: Jan 2009
Posts: 813
Ontario,Canada
brads70 Offline
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Ontario,Canada
I have a healthy 451 and am using a stainless magnaflow 2 1/2" system and it's pretty loud, especially when I get on it. I'm thinking of using something at the end of the tail pipe to act as a resonator? It's not too loud in the car but behind somewhat.... not REAL loud but enough to attract attention. I figure sooner or later the police will be on my case.....

Last edited by brads70; 03/12/16 01:46 AM.






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