Do you run headers ?

[Groucho]

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The LS5 in question is still mild. Its got probably a little bit more than it did from the factory. But still running a Q-jet and cast intake. My fairly healthy comment meant that its not a tired old motor...
Well I am looking for a more aggressive musclecar sound. So you are saying I will have a more agressive sound in general by leaving it as is with manifolds?

[/ QUOTE ]Well, I don't know what your opinion of aggressive is. But, as I said, some sound will dissipate through the header tubes themselves. That is a sound I happen to like, but it comes more from the engine compartment area than the exhaust tips. Because of the dissipation of sound from the header tubes,less sound makes it to the tips, usually making it a bit quieter, BUT IMO better in quality. Make sense? In my 1st response, I wasn't trying to talk you out of installing headers. I was just giving you something to think about, so you didn't expect too much