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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 04-01-2011, 11:20 PM   #1
melbourne_ls1
 
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2011 LS3 Coupe vs L99 Vert stock exhaust

Here are a couple of pictures showing the differences between a 2011 LS3 Coupe exhaust and a 2011 L99 Vert exhaust.

I installed the LS3 Coupe exhaust along with the SLP Loudmouth axle back (which was previously installed with the L99 vert exhaust) on my vert tonight and I absolutely love the sound. In my opinion, there is just way too many restrictions in the L99 vert exhaust.
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Old 04-01-2011, 11:24 PM   #2
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BTW, the L99 exhaust in the pics weighed 37lbs. The stock mufflers weigh in at 19.5lbs each. (I didn't weigh the LS3 exhaust before I installed it, but it was significantly lighter which is obvious from the pics).
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Old 04-02-2011, 12:26 AM   #3
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Great solution for the OEM LS3 exhaust. Glad to have helped you out.
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Old 04-02-2011, 07:21 AM   #4
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wow that was quick you didnt waste any time installing it yesterday
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Old 04-03-2011, 08:09 PM   #5
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Quote:
Originally Posted by melbourne_ls1 View Post
BTW, the L99 exhaust in the pics weighed 37lbs. The stock mufflers weigh in at 19.5lbs each. (I didn't weigh the LS3 exhaust before I installed it, but it was significantly lighter which is obvious from the pics).
My stock LS3 mid pipes and cat back (didn't cut it, just took it out as one piece) weighed in at 71.4 lbs.
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Old 04-03-2011, 08:39 PM   #6
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what are those rod things sticking through the L99 exhaust towards the rear?
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Old 04-03-2011, 09:21 PM   #7
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From what I have gathered, they are some sort of spring loaded flaps that have been added to the L99 verts (my L99 coupe didn't have them) to help minimize some of the resonance when the AFM kicks in and out.
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Old 04-03-2011, 09:25 PM   #8
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the l99 vert exhaust looks the same as a l99 coupe exhaust. the vert does really change anything for the most part.
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Old 04-03-2011, 10:17 PM   #9
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Except the L99 Coupe exhaust doesn't have those spring loaded "rod things sticking through". At least my 2010 L99 Coupe didn't. Those things have to make the exhaust more restrictive.

Hey, anyone with a 2011 L99 Coupe, does your exhaust have these things?
(see side-by-side pics above, left side on first pic, right side on second pic)
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Old 04-03-2011, 10:48 PM   #10
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i have read people saying "they haven't made any exhaust after market options for the verts" when the vert really has no difference in size or shape or what ever. ya maybe those rods are weird, but from the looks of it any l99 or ls3 non vert camaro after market exhaust should fit up to a vert
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Old 04-03-2011, 11:37 PM   #11
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Quote:
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i have read people saying "they haven't made any exhaust after market options for the verts" when the vert really has no difference in size or shape or what ever. ya maybe those rods are weird, but from the looks of it any l99 or ls3 non vert camaro after market exhaust should fit up to a vert
Tell that to Drago77.
http://www.camaro5.com/forums/showpo...11&postcount=8

Some fit some don't. My complete XSPower 1 7/8" headers and complete 3" exhaust fit but only because I welded it up and didn't use the supplied clamps. Even then it was a VERY tight fit. I don;t think you could get it to fit by just using the supplied clamps.
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Old 04-03-2011, 11:53 PM   #12
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Originally Posted by SUX2BU View Post
Tell that to Drago77.
http://www.camaro5.com/forums/showpo...11&postcount=8

Some fit some don't. My complete XSPower 1 7/8" headers and complete 3" exhaust fit but only because I welded it up and didn't use the supplied clamps. Even then it was a VERY tight fit. I don;t think you could get it to fit by just using the supplied clamps.
ya you might have to do a little adjusting, but that still wont stop me.
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Old 05-10-2011, 09:55 PM   #13
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just another moving part waiting to **** up! Im glad i didnt get an L99 car. No offense to those of you that did, but everything from the bad lifters to the AFM thing whacking out whenever you modify anything. No thanks. Chevy should have just put in the LS3 in automatics too. Just like the vettes. problem solved!
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Old 05-11-2011, 04:56 PM   #14
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Chevy should have just put in the LS3 in automatics too. Just like the vettes. problem solved!
THIS!!!!!
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Old 02-05-2013, 09:39 PM   #15
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Those butterfly valves are only on the L99 convertibles and according to my dealership are installed to reduce exhaust sound (AFM) on the verts.

Also, there is a Service bulletin out there about a squeaky noise they can make when they open.


Have it on mine and its annoying as can be. Almost makes me not want to accelerate. No just kidding, actually it makes me floor it harder so that I can't hear it

Last edited by sswiss3000; 02-05-2013 at 10:06 PM.
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Old 02-05-2013, 09:48 PM   #16
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Quote:
Originally Posted by sswiss3000 View Post
Those butterfly valves are only on the convertibles and according to my dealership are installed to reduce exhaust sound on the verts.

Also, there is a Service bulletin out there about a squeaky noise they can make when they open.


Have it on mine and its annoying as can be. Almost makes me not want to accelerate. No just kidding, actually it makes me floor it harder so that I can't hear it
Lol your making us look bad sir!

Check the date of the first and last post lol.
I'm glad your using the search button though lol.
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Old 02-05-2013, 10:06 PM   #17
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Smile, I know I may be a bit behind the curve on this, but I just learned about his today and I figured a nice closing statement was still needed for this thread
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Old 02-05-2013, 10:20 PM   #18
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Lol closure. Sounds good to me then.
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