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Old 11-17-2012, 04:22 PM   #1
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DUAL MODE EXAHUST

I posted this question last week in the camaro motorsports discussion and have yet to get an answer,so maybe it was in the wrong place.I used to race superbikes,and one track i never got to do was Laguna Seca.I am going to be doing track days with my 1LE. Laguna Seca has a decibel limit, i think 92 or 93. Does anyone know what decibles our 1LES will be putting out at full throttle? Oh yeah, here's a really cool pic.
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Old 11-17-2012, 05:42 PM   #2
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I don't know any answers to your decible question but that is a very cool picture!!
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Old 11-17-2012, 05:53 PM   #3
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I placed a order for a 1le today and went for a test drive with the npp exhaust. I don't know about decibels but that is one sweet exhaust note.
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Old 11-17-2012, 07:26 PM   #4
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I don't know any answers to your decible question but that is a very cool picture!!
Thank you,was having the time of my life.
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Old 11-17-2012, 07:53 PM   #5
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A decibel limit on a race track? That's just not right.
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Old 11-17-2012, 07:55 PM   #6
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Don't know how many decibels it puts out but I would imagine it should be fine. What kind of race track has a decibel limit? Only in California. With all the cars that have been on that track it doesn't make sense to have a limit. Maybe it's only for certain times.
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Old 11-17-2012, 08:31 PM   #7
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You have to think like Larry Ellison, CEO of Oracle. There's a decibel limit for jet engine noise after 10pm in San Jose. He just pays the fine.
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Old 11-17-2012, 08:34 PM   #8
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Yes im sure it has to do with the snobs in wine country,i mean MotoGP runs there and they certianly blow the noise barrier off the chart.
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Old 11-20-2012, 05:57 PM   #9
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I'd have to imagine that if the dual-mode exhaust is street-legal, then it will definitely meet the decibel requirements for a racetrack.
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Old 11-20-2012, 06:36 PM   #10
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Thanks,i would think so too,just checking.
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Old 11-20-2012, 07:00 PM   #11
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I run the OEM dual mode with Kooks LT headers & hi flow cats. I also run a mild 2 wild controller. The two modes are loud and daddy that hurts my ears. I was surprised how loud it can get. I have not measured the dB levels yet.
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Old 11-20-2012, 07:17 PM   #12
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One of the reviews of the 1LE had a db level listed. I will see if I can find it. It was in the last week that I saw it.


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Old 11-20-2012, 07:25 PM   #13
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Found it. But it is interior levels. Best I got...lol

http://www.roadandtrack.com/var/ezfl...dee8badcbe.pdf

Looks like you would be cutting it pretty close
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Old 11-20-2012, 07:36 PM   #14
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Many tracks i go to have decible levels.... U will be fine with the npp. It is loud and nice but nowhere close to race cars meeting those levels.
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Old 11-20-2012, 08:05 PM   #15
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Thank you gentleman.
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Old 11-20-2012, 10:58 PM   #16
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The cats end up muffling quite a bit so you should be good to go =)
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Old 11-21-2012, 12:33 AM   #17
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The cats end up muffling quite a bit so you should be good to go =)
The stock LS3 also has resonators after the cats!!
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Old 11-21-2012, 12:37 AM   #18
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I run the OEM dual mode with Kooks LT headers & hi flow cats. I also run a mild 2 wild controller. The two modes are loud and daddy that hurts my ears. I was surprised how loud it can get. I have not measured the dB levels yet.
Would love to hear this setup.
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Old 11-21-2012, 04:12 AM   #19
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Originally Posted by cornerspeed92 View Post
I posted this question last week in the camaro motorsports discussion and have yet to get an answer,so maybe it was in the wrong place.I used to race superbikes,and one track i never got to do was Laguna Seca.I am going to be doing track days with my 1LE. Laguna Seca has a decibel limit, i think 92 or 93. Does anyone know what decibles our 1LES will be putting out at full throttle? Oh yeah, here's a really cool pic.
Nice, a Fellow WSMC racer. Raced there myself up till 2004. I sure do miss willow and like you said never Road Laguna. Been there bunches of times to watch MotoGP, AMA World Superbike. Look forward to hearing how or was.
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Old 11-21-2012, 08:02 AM   #20
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I pulled the fuse for my dual flow mufflers and it set a dash light off. I put the fuse back in and after three starts the dash light cleared.
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Old 11-21-2012, 03:12 PM   #21
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GM NPP exhaust does not have resonators. CATS-H-Pipe the dual exhaust mufflers.
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Old 11-23-2012, 12:51 PM   #22
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Nice, a Fellow WSMC racer. Raced there myself up till 2004. I sure do miss willow and like you said never Road Laguna. Been there bunches of times to watch MotoGP, AMA World Superbike. Look forward to hearing how or was.
Yes WSMC was the best time of my life,what was you're # i raced there til 05.I put my 2011 1LT RS/RS on Willow,as you know that track is so tuff on tires.I will want to put my 1LE on the track,but not with these Goodyears we are getting,kinda expensive tires.
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Old 11-23-2012, 06:12 PM   #23
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You should be OK. I run no muffler with stock exhaust and I pass the San Diego SCCA noise police. And its a tougher standard than LS.
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Old 11-23-2012, 07:26 PM   #24
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Thank you.
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Old 11-23-2012, 07:49 PM   #25
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GM NPP exhaust does not have resonators. CATS-H-Pipe the dual exhaust mufflers.
Thanks for the correction.
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