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04-24-2013, 07:29 PM
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#29 | |
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Est.1775
Drives: '15 Challenger Hellcat (sold) Join Date: Sep 2009
Location: SoCal
Posts: 5,499
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05-11-2014, 10:23 PM
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#30 |
 Drives: 328xi, ML400, ZL1 man. 2013 Join Date: Aug 2012
Location: Quebec
Posts: 153
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Mine failed 2 weeks ago, a beard came out of the driver side muffler. After a visit to the dealer, who ordered a new exhaust system, I pulled out the "beard". Despite the removal of the expulsed wool there was still a good quantity left visible deep inside the muffler. Don't just settle at pulling out the filaments, have these mufflers replaced
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05-27-2014, 06:58 PM
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#31 |
 
Drives: 12 ZL1 & 08 Suzuki Boulevard C50 Join Date: Oct 2011
Location: Ocean Shores, WA
Posts: 406
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I have #413 and just went over 8k miles today and I have the strings coming out of exhaust. I have no performance mods.
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2012 ZL1 - #413 - IOM - Mods; Exhaust Commander. GMG Third Brake Light Pulsar, Tinted Windows, color matched Engine cover, ZL1 Floor Mats
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05-27-2014, 09:08 PM
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#32 |
     Drives: ZL1, 2013, tri-coat-red, manual Join Date: Nov 2013
Location: Michigan
Posts: 1,657
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Just hit 4700 miles no mods, left side started dumping out in big sections..
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06-03-2014, 06:39 PM
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#33 |
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Drives: 12 ZL1 & 08 Suzuki Boulevard C50 Join Date: Oct 2011
Location: Ocean Shores, WA
Posts: 406
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Just got back from the dealer and they put a new exhaust on order. No questions
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2012 ZL1 - #413 - IOM - Mods; Exhaust Commander. GMG Third Brake Light Pulsar, Tinted Windows, color matched Engine cover, ZL1 Floor Mats
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06-03-2014, 09:03 PM
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#34 |
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Rumblebee
Drives: ZL1 Rally Yellow Join Date: Apr 2013
Location: Germany
Posts: 157
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Are there any effects of the wool coming out?
Happened twice to me, first time solved itself, 2 weeks ago it came out after 20 miles of high speed, i just pulled it out with my hands and haven't noticed any difference. 
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'13 ZL1 Rally Yellow A6 Coupe
From dusk till dawn, hammering the Autobahn: https://www.youtube.com/watch?v=EReANdItaE0 |
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06-03-2014, 09:06 PM
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#35 |
     
Drives: '21 ZLE A10 Join Date: May 2012
Location: Mechanicsville, VA
Posts: 6,824
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the "steel wool" came out of mine once and the problem never happened again and I have run my car way harder than 99.9% of people here. It has 800 miles at VIR on the clock.
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'21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60'
'17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold) '15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold) '12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold) |
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06-05-2014, 02:28 AM
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#36 |
Drives: 13 ZL1 SIM, 99 Z28 Black Join Date: Feb 2013
Location: Spokane, WA
Posts: 708
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Probably makes it a little louder. No problem.
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2018 C7 Z06 - WGG, M7. / 2013 ZL1 - SIM, 6 spd, RotoFab CAI, Can. / 1999 Z28 - Black, 6 spd, K&N, Subframe. / More Fun Stuff - www.inlandspeed.com
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06-06-2014, 04:14 PM
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#37 |
Drives: ZLI IOM Convertible Join Date: Oct 2012
Location: Kennewick, Washington
Posts: 155
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same thing just happened to me. 15k miles , no mods. Just pulled two big clumps out. Reminds me of the old glass pack days. I think we are blowing out the fiberglass from the muffler. Just called my dealer yesterday about coming in to replace the isolator. Calling him back now to see about this.
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06-06-2014, 05:01 PM
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#38 | |
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Drives: ZLI IOM Convertible Join Date: Oct 2012
Location: Kennewick, Washington
Posts: 155
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06-06-2014, 08:41 PM
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#39 |
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1st Civ. Div.
Drives: Camaroless for now...RIP "Big SexZ" Join Date: Dec 2007
Location: Savannah, Ga
Posts: 2,729
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Does this problem only effects guys running without the exhaust fuse pulled or is it not a factor so far? Just curious to know if it makes a difference or not since I run my exhaust with fuse pulled which directs most of the exhaust gases thru the outside bypass part of the muffler and I see most of the pics show the inside part having the issue.
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Swift....Silent....Deadly
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03-28-2017, 09:15 PM
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#40 |
 Drives: None right now Join Date: Mar 2017
Location: NC
Posts: 87
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I know I'm super late to this, but I just bought a 13 1LE yesterday...
I was looking around at some stuff in the garage tonight and noticed this issue in both mufflers on my dual mode... Any second owners had any luck with a dealership or GM helping you out? |
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03-29-2017, 07:53 AM
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#41 |
Drives: 2002 Camaro SS SOM; 2015 Malibu LTZ Join Date: Dec 2010
Location: Queens, NY
Posts: 4,070
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Very old thread. This is a common occurrence with OEM mufflers. It is actually a good thing in our case. The muffler will still work. The interior insulation gets worn and starts to shed. Over time your OEM exhaust will actually get a tad louder, but there should be no concern over the packing material shedding. GM/Chevy uses this insulation to maintain their minimum standard on exhaust sound levels for new cars. The exhaust on ours is louder than most cars, but even with our model GM has an established limit on sound level.
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'02 CAMARO SS SOM; 5.7L LS1/FLS6B
'08 TBSS AWD Black Granite Metallic '15 Malibu LTZ 2LZ Turbo '14 CAMARO ZL1 Blue Ray Metallic '25 Silverado 1500 High Country 6.2L |
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03-29-2017, 08:07 AM
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#42 |
Drives: 02 Z06, 95 Trans Am, 2012 ZL1 Join Date: Mar 2012
Location: Southeast
Posts: 1,838
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I just pulled mine out on 1 side and it never occurred again.
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 Bryan 2018 ZL1 M6 |
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