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

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Old 05-30-2013, 03:04 PM   #1
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L99 and LS3 stock exhaust manifolds are the same?

I'm 99% sure but I need to know if the stock exhaust manifolds are the same. I know the catted extension isn't exactly the same.

The L99 catted mid-pipe will work on an LS3 but the LS3 will not fit very well on an L99 but is doable.
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Old 05-30-2013, 04:02 PM   #2
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Originally Posted by Nutro View Post
I'm 99% sure but I need to know if the stock exhaust manifolds are the same. I know the catted extension isn't exactly the same.

The L99 catted mid-pipe will work on an LS3 but the LS3 will not fit very well on an L99 but is doable.
IIRC, the only difference is the L99 midpipe has a flexible section, whereas the LS3 pipe does not. Otherwise I think they are the same geometrically.
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Old 05-31-2013, 12:59 AM   #3
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Yeah that's what I remember reading. I can use the flexible L99 pipes on an LS3 but not easily the other way around.

Manifolds should be identical.
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Old 05-31-2013, 12:02 PM   #4
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The manifolds are the same.
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Old 05-31-2013, 12:30 PM   #5
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my pipe wasnt flexable on my L99
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Old 05-31-2013, 12:37 PM   #6
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Quote:
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my pipe wasnt flexable on my L99
Really? 1st I've heard of that. All the L99 cats should have a flexable part.
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Old 05-31-2013, 12:41 PM   #7
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I had a flexible joint between my manifold and cats when I took them off to install headers.
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Old 05-31-2013, 01:58 PM   #8
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if i can dig them out of my parts collection I will take a picture. There has been wierder on my car so it would not surprise me
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Old 05-31-2013, 02:37 PM   #9
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Why are you asking???? Do you need a set? I have my stock ones, manifolds and cats, looking to sell. PM me if you are interested.
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