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

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Old 04-07-2010, 03:21 PM   #1
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So we dissected an L99 resonator today....

I am a GM ASEP instructor at San Jacinto College as well as a Camaro fanatic (unfortunately, my dad's the one that owns it). During Engine Performance class we were talking about Active Displacement. My dad had replaced his resonator on his 2SS (L99) with an x-pipe and was stunned at the discoloration of the resonator and the improvement in performance after replacing it. BTW, theres about 6K miles on the resonator. Our welding department has a very talented craftsman, Hector, who did the dissection for us. I was curious as to the design and why there would be so much heat buildup. Here's the pics.....
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Old 04-07-2010, 03:25 PM   #2
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nicely done... now i know what i got rid of!
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Old 04-07-2010, 03:29 PM   #3
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thats an ugly SOB
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Old 04-07-2010, 04:27 PM   #4
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That looks like it would act more as a muffler than the two hollow trash cans behind the rear fascia.
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Old 04-07-2010, 04:29 PM   #5
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Boat anchor
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Old 04-07-2010, 04:38 PM   #6
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RESTRICTIVEEEEEEEEEEEEEEEEEEEEEEEEEEE




And yes a Boat Anchor
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Old 04-07-2010, 08:40 PM   #7
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@RedJewel2SS....love the heritage grill!
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Old 04-07-2010, 08:41 PM   #8
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What do these things do that only the l99 need them and not the ls3
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Old 04-07-2010, 08:53 PM   #9
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keeps the AFM sound from being so pronounced
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Old 04-07-2010, 09:00 PM   #10
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i don't want this on my car.
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Old 04-08-2010, 02:17 PM   #11
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Just shows you that with a few select mods, the L99 would be closer in power to an LS3..Would be interesting to see a swap on an L99 car where they just change the exhaust over to an LS3 setup to see how many lost ponies in the exhaust...that resonator has got to account for quite a few dead horses.
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Old 04-09-2010, 04:47 AM   #12
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Well done thanks for sharing
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Old 04-09-2010, 06:39 AM   #13
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Quote:
Originally Posted by ZYA_LTR View Post
Just shows you that with a few select mods, the L99 would be closer in power to an LS3..Would be interesting to see a swap on an L99 car where they just change the exhaust over to an LS3 setup to see how many lost ponies in the exhaust...that resonator has got to account for quite a few dead horses.
The L99 also uses different mufflers. They look the same on the outside, but they are very different on the inside. There are some pictures floating around the forum of the inside of the L99 mufflers. The LS3 muffers are a straight through muffler. The L99 mufflers have this crazy piping on the inside to help reduce AFM noises.
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Old 04-09-2010, 07:25 AM   #14
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Quote:
Originally Posted by SGOS252382 View Post
The L99 also uses different mufflers. They look the same on the outside, but they are very different on the inside. There are some pictures floating around the forum of the inside of the L99 mufflers. The LS3 muffers are a straight through muffler. The L99 mufflers have this crazy piping on the inside to help reduce AFM noises.
GM engineered this for those reasons, because logically peoples tonal expectations would be way off if they used a standard muffler system once AFM kicked in. Perception is everything, but I must say that like other members, its a boat anchor and get an aftermarket unit then tune out AFM.

Very neat

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Old 11-01-2010, 06:58 PM   #15
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finally, one cut open...think mine is going soon
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Old 11-01-2010, 07:13 PM   #16
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Can you pleeeeeaaaaase now cut open an LS3 resonator so we can see what's inside???
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Old 11-01-2010, 07:29 PM   #17
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This is very interesting. These images definitely give us a good insight into what the L99 guys could do without. GM did a great job making these V8s powerful and sounding good. With a little work, these can sound more aggressive and really reduce the restriction.
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Old 11-01-2010, 07:35 PM   #18
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Quote:
Originally Posted by SGOS252382 View Post
The L99 also uses different mufflers. They look the same on the outside, but they are very different on the inside. There are some pictures floating around the forum of the inside of the L99 mufflers. The LS3 muffers are a straight through muffler. The L99 mufflers have this crazy piping on the inside to help reduce AFM noises.
J pipe
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Old 11-02-2010, 02:08 AM   #19
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Quote:
Originally Posted by SGOS252382 View Post
The L99 also uses different mufflers. They look the same on the outside, but they are very different on the inside. There are some pictures floating around the forum of the inside of the L99 mufflers. The LS3 muffers are a straight through muffler. The L99 mufflers have this crazy piping on the inside to help reduce AFM noises.
If you follow the piping, you'll notice that the L99 muffler is a straight thru muffler as well. It just has that J pipe on it. That's GM's version of a Helmholtz tube. It works VERY well as you never hear a L99 owner, with the OEM mufflers, complain about drone.
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Old 11-02-2010, 05:37 AM   #20
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Very well done, glad I am seriously looking at my options for removal.
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Old 11-02-2010, 06:51 AM   #21
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Verrrrrrry interesting!
It seems that the small tube opening in the bottom of the resonator turns the back chamber into a Helmholtz resonator for both pipes, and the high-heat area appears to be a crude x- or h- chamber. Can't accuse Exhaust Engineering Dept. of not trying something different.
I still think that Edelbrock piece is better.
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Old 11-02-2010, 09:35 AM   #22
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So what do you need to replace this resonator? A X-Pipe? Who make them?

Bill
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Old 11-02-2010, 11:55 AM   #23
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See post #21 above.
http://www.camaro5.com/forums/showthread.php?t=113268
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Old 11-02-2010, 02:05 PM   #24
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Good info.
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Old 11-02-2010, 02:10 PM   #25
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So what do you need to replace this resonator? A X-Pipe? Who make them?

Bill
There are several options. The X pipe is the most common and is what I have. I have just the X pipe section and had my muffler guy cut and weld it in with the extra pipe. There's complete replacement X pipe setups, as well a resonated X pipes. I'm sure someone makes a H pipe but I haven't seen one advertised. Depending on which way you go, you're looking at $150+ for the swap.
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