Factory convertible catback question? LS3 vs L99 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

SS PANTHER · 06-01-2017, 06:59 AM

Is there any difference between the LS3 and L99 factory OEM SS convertible catback system other than the butterfly valves for the AFM on the L99 system?I'm looking to buy a factory SS convertible catback system, complete in excellent condition.

Smokin19 · 06-01-2017, 07:33 AM

Quote:

Originally Posted by SS PANTHER

Is there any difference between the LS3 and L99 factory OEM SS convertible catback system other than the butterfly valves for the AFM on the L99 system?I'm looking to buy a factory SS convertible catback system, complete in excellent condition.

Never heard of an OEM catback system. I have this for sale in the classified's. Stainless Works muffler delete pipes with 4" polished tips and the Range delete to eliminate the AFM.

SS PANTHER · 06-01-2017, 07:50 AM

OEM=Original Equipment Manufacturer. It is the same term as, the 'factory' catback exhaust system. I have F.I. and have AFM tuned out. I miss the sound and quietness of the factory mufflers, resonator, etc. with my headers and high flow cats. My current Solo catback system is too loud for me and produces 114db's at 4000rpms, which, is about 20db's over the states 95db Max.

partlowr · 06-01-2017, 09:55 AM

Convertibles have a cross member which will require you to install some spacers or washers for most aftermarket exhaust to clear the cross member. There are a few companies that offer a specific system for the verts that will clear that cross member but you can easily make any system work on a vert. I have the Lingenfelter by Corsa system on my vert(which is not a vert specific system), I had to add a few washers for spacers but it bolted up and works just fine.

Moreair1 · 06-01-2017, 10:13 AM

This is what a ls3 vert exhaust looks like

Ryanbabz71 · 06-01-2017, 11:30 AM

Different resonator

Ryan B.

SS PANTHER · 06-01-2017, 12:33 PM

Quote:

Originally Posted by Moreair1

This is what a ls3 vert exhaust looks like

Quote:

Originally Posted by Ryanbabz71

Different resonator

Ryan B.

Yes, I can see and remember my L99 catback had a large box resonator. The LS3 pictured has a H-pipe instead. The bends will be the same, but, I wonder if the large resonator on the L99 makes it quieter and was designed to reduce AFM drone? Or if it has some purpose related to the auto trans. I just don't want to purchase a LS3 system to find out there are clearance problems, or it is much louder than the L99 system. A specific answer would be appreciated. Thanks for your replies.

Moreair1 · 06-01-2017, 01:04 PM

To be honest the ls3 version is pretty quiet, with lt, and hi flow cats would sound pretty good

Moreair1 · 06-01-2017, 01:06 PM

I believe the difference is just to hide the afm sounds

SSEssence · 06-01-2017, 01:39 PM

The L99 version has a huge suitcase looking resonator compared to the LS3 version. Putting the LS3 exhaust on a L99 may make the car a little louder but everything will mount up fine.

Moreair1 · 06-01-2017, 03:39 PM

I would ask in the force induction forum, maybe some has one has a sound clip of there camaro with a ls3 exhaust with lts and high flow converters

Royal Tiger · 06-01-2017, 04:29 PM

This was my stock L99 exhaust:

SS PANTHER · 06-02-2017, 12:04 AM

I had the factory catback on the car with all the mods and it sounded good and was quiet on the freeway and street. I got the mod bug and decided to get a aftermarket catback on black Friday last year and have never been satisfied with it. I'm just going back to the factory L99 catback. Thanks for your input.

06-01-2017, 06:59 AM	#1
SS PANTHER Drives: 2013 SS Supercharged Convertible Join Date: May 2013 Location: SoCal Posts: 2,713	Factory convertible catback question? LS3 vs L99 Is there any difference between the LS3 and L99 factory OEM SS convertible catback system other than the butterfly valves for the AFM on the L99 system?I'm looking to buy a factory SS convertible catback system, complete in excellent condition.

06-01-2017, 09:55 AM	#4
partlowr Drives: 2011 2SS/RS Convertible Join Date: Jan 2017 Location: Naperville, IL Posts: 256	Convertibles have a cross member which will require you to install some spacers or washers for most aftermarket exhaust to clear the cross member. There are a few companies that offer a specific system for the verts that will clear that cross member but you can easily make any system work on a vert. I have the Lingenfelter by Corsa system on my vert(which is not a vert specific system), I had to add a few washers for spacers but it bolted up and works just fine. __________________ Richard Partlow

06-01-2017, 10:13 AM	#5
Moreair1 Drives: 2011 ss convertible Join Date: Jul 2015 Location: Colorado Posts: 1,329 View My Garage	This is what a ls3 vert exhaust looks like Attached Images __________________ Cai intake and a few other mods😎

06-01-2017, 11:30 AM	#6
Ryanbabz71 Drives: 2021 ZL1 1LE Satin Steel Join Date: Jul 2011 Location: Brownsburg, Indiana Posts: 6,377 View My Garage	Different resonator Ryan B. __________________ Ryan 2021 ZL1 1LE Satin Steel Metallic Build Page: https://www.camaro6.com/forums/showthread.php?t=632481

06-01-2017, 01:04 PM	#8
Moreair1 Drives: 2011 ss convertible Join Date: Jul 2015 Location: Colorado Posts: 1,329 View My Garage	To be honest the ls3 version is pretty quiet, with lt, and hi flow cats would sound pretty good __________________ Cai intake and a few other mods😎

06-01-2017, 07:50 AM	#3
SS PANTHER Drives: 2013 SS Supercharged Convertible Join Date: May 2013 Location: SoCal Posts: 2,713	OEM=Original Equipment Manufacturer. It is the same term as, the 'factory' catback exhaust system. I have F.I. and have AFM tuned out. I miss the sound and quietness of the factory mufflers, resonator, etc. with my headers and high flow cats. My current Solo catback system is too loud for me and produces 114db's at 4000rpms, which, is about 20db's over the states 95db Max.

06-01-2017, 01:06 PM	#9
Moreair1 Drives: 2011 ss convertible Join Date: Jul 2015 Location: Colorado Posts: 1,329 View My Garage	I believe the difference is just to hide the afm sounds __________________ Cai intake and a few other mods😎

06-01-2017, 01:39 PM	#10
SSEssence Instagram: Sangstah Drives: 2019 Camaro 1LE Join Date: Sep 2016 Location: Buena Park, CA. Posts: 2,836 View My Garage	The L99 version has a huge suitcase looking resonator compared to the LS3 version. Putting the LS3 exhaust on a L99 may make the car a little louder but everything will mount up fine.

06-01-2017, 03:39 PM	#11
Moreair1 Drives: 2011 ss convertible Join Date: Jul 2015 Location: Colorado Posts: 1,329 View My Garage	I would ask in the force induction forum, maybe some has one has a sound clip of there camaro with a ls3 exhaust with lts and high flow converters __________________ Cai intake and a few other mods😎

06-01-2017, 04:29 PM	#12
Royal Tiger Account Suspended Drives: 2013 2SS/RS Convertible Join Date: Apr 2016 Location: Lehigh Valley, PA Posts: 3,873	This was my stock L99 exhaust:

06-02-2017, 12:04 AM	#13
SS PANTHER Drives: 2013 SS Supercharged Convertible Join Date: May 2013 Location: SoCal Posts: 2,713	I had the factory catback on the car with all the mods and it sounded good and was quiet on the freeway and street. I got the mod bug and decided to get a aftermarket catback on black Friday last year and have never been satisfied with it. I'm just going back to the factory L99 catback. Thanks for your input.